<P> Lexie feels immense guilt following George's death, having abandoned their friendship after he failed to reciprocate her romantic feelings towards him . She is consoled by Mark and, after becoming a surgical resident, agrees to move into his new apartment with him . Lexie and the other residents grow increasingly stressed in the wake of Chief Webber's announcement that there will be a merger with Mercy West Hospital, meaning that Seattle Grace will have to layoff a large percentage of its staff members . Mark encourages Lexie to relax and just try her best during this period, advising her not to worry as she deserves her job . Lexie soon finds that while she is safe from the layoffs, many of her friends have been cut from the program . To take everyone's minds off the merger, Owen takes Lexie, Mark, Derek, Meredith, and Cristina to play baseball together . Thatcher is later admitted into the hospital with liver failure stemming from his former alcoholism . When Lexie discovers that she is not a suitable transplant candidate, Meredith steps in and donates part of her liver to Thatcher to spare Lexie the grief of losing her father . Mark and Lexie receive a shock when a pregnant teenage girl named Sloan Riley (Leven Rambin) shows up claiming to be Mark's daughter, and her parentage is soon confirmed . Mark quickly agrees to let Sloan and the baby move in permanently without consulting Lexie, resulting in her ending their relationship as she feels she is still too young to be a grandmother . An upset and drunk Lexie then engages in a one - night stand with Alex but feels guilty and confesses to Mark, who becomes furious with her despite also admitting that he had a one - night stand with Addison Montgomery (Kate Walsh). Although she secretly suppresses her feelings for Mark, Lexie and Alex assume a casual relationship that Lexie begins to take too seriously and flaunts to make Mark jealous . Lexie later breaks down in front of Meredith when Alex tells her that Mark legitimately plans on moving on from her . After Sloan gives her baby up for adoption and leaves Seattle, however, Mark approaches Lexie and confesses his love to her . A stunned Lexie hesitantly states that Alex is now her boyfriend, to which Mark replies, "I know . I'm just saying you could have a husband ." Lexie takes part in a surgery on a patient named Alison Clark (Caroline Williams) and informs her husband Gary Clark (Michael O'Neill) that it was a success . But moments later, Alison suffers a stroke and falls into a coma that Derek and Webber state that she is unlikely to wake from . As Alison had signed a DNR form, Lexie is forced to turn off the machines keeping her alive despite Gary begging her to stop . After failing in an attempt to sue the hospital, a grief - stricken Gary Clark later returns to the hospital with a gun, seeking revenge on Lexie, Derek and Webber . After witnessing Clark shoot a nurse dead, Mark shields Lexie during the shooting and the pair attempt to save a critically wounded Alex . Seeking supplies, Lexie heads out into the hospital and comes face to face with Clark . Before he can shoot Lexie, however, a SWAT team member wounds Clark and Lexie manages to escape . Lexie and Mark proceed to save Alex's life, during which Lexie realizes that Alex is still in love with his ex-wife Izzie, as he calls for her while delirious and on the verge of death . After having a conversation with Webber, Gary Clark eventually commits suicide, having killed eleven people and wounding another seven as well as causing Meredith to suffer a miscarriage . </P> <P> Suffering from PTSD and sleep depravation after the shooting, Lexie has a psychotic breakdown and is admitted to the hospital's psychiatric ward, where she is sedated for over fifty hours with Meredith remaining by her side . Alex, on the other hand, breaks off his relationship with Lexie because he cannot handle having to care for a person going through PTSD and he enjoys sleeping with women that find having been shot to be attractive . Lexie, after recovering and being discharged, confronts Alex and knocks him down a peg by telling him that the reason he is alive is because of her . Lexie becomes irritated when others at the hospital view her as fragile and incompetent due to her breakdown and works hard to repair her image; she saves a woman from being paralyzed when no one else caught the issue . She continues to gain her confidence throughout the season and helps Miranda Bailey (Chandra Wilson) discover a cure for hospital fistulas . Meanwhile, Lexie and Mark never seem to get their timing right, with Lexie hostile and angry at Mark when he wishes to reconcile, and Mark being caught sleeping with a flavor of the day when Lexie wants to rekindle their relationship . When Lexie and Mark both ultimately realize that they continue to have feelings for each other, however, they resume their relationship . Their happiness once again comes to a halt when Lexie discovers that during their break - up, Mark had unintentionally impregnated Callie, and she ends their relationship once more because she is not ready for children . Eager to win Lexie back, Mark recruits his protégé Jackson Avery (Jesse Williams) to try to bring him back into Lexie's favor, but his plan backfires when Jackson enters a relationship with Lexie . Mark is furious and tries to win Lexie back but shortly after, Callie is involved in a car accident and Lexie consoles Mark . Soon after, Lexie explains that she will always love Mark and go back to him if he continues to pursue her, but she believes that they aren't suited because they have different desires . Mark then agrees to let her go, giving her and Jackson his blessing . </P> <P> Although initially happy in her relationship with Jackson, Lexie grows increasingly distraught when Mark begins a relationship with an ophthalmologist named Julia . At a charity softball match, Lexie's jealousy gets the better of her when she throws a ball at Julia and injures her . Sensing that Lexie is still in love with Mark, Jackson ends their relationship . Lexie begins working under Derek's service and becomes more and more proficient in neurosurgery, helping Derek with a set of "hopeless cases" - high risk surgeries for patients who had otherwise run out of options . During a surgery, Derek is called away on an emergency, leaving Lexie and Meredith to carry out the procedure on their own . Though Derek had instructed them to merely reduce the patient's brain tumor, Meredith allows Lexie to remove it completely, despite not being authorized by either the patient or Derek to do so . The sisters celebrate the successful surgery but Lexie is devastated when she discovers that the patient suffered severe brain damage, thus losing the ability to speak . Alex, Jackson and April Kepner (Sarah Drew) move out of Meredith's house without inviting Lexie to join them, and with Derek and Meredith settling down with baby Zola, Lexie begins to feel lonely and isolated . After being left babysitting Zola on Valentine's Day, she contemplates confessing her true feelings to Mark . However, after plucking up the courage to visit his apartment, she finds Mark studying with Jackson and loses her nerve, instead claiming that she wanted to set up a play date for Zola and Sofia . When Mark confides in Derek that he and Julia have been discussing moving in together, Derek warns Lexie not to miss her chance again, resulting in her professing her love to a shell - shocked Mark, who merely thanks her for her candor . Mark later confesses to Derek that he feels the same way about Lexie, but is unsure of how to go about things . Days later, Lexie is named as part of a team of surgeons that will be sent to Boise to separate conjoined twins, along with Mark, Meredith, Derek, Cristina and Arizona Robbins (Jessica Capshaw). However, while flying to their destination, the doctors' plane crashes in the wilderness and Lexie is crushed under debris from the aircraft but manages to alert Mark and Cristina to help her . The pair try in vain to free Lexie, who realizes that she is suffering from a hemothorax and is unlikely to survive . While Cristina tries to find an oxygen tank and water to save Lexie, Mark holds Lexie's hand and professes his love for her, telling her that they will get married, have kids and live the best life together, as they are "meant to be". While fantasizing about the future that she and Mark could have had together, Lexie succumbs to her injuries and dies moments before Meredith arrives . The remaining doctors are left stranded in the woods waiting for rescue, with a devastated Meredith crying profusely and Mark refusing to let go of Lexie's hand . </P> <P> The remaining surgeons are rescued from the wilderness days later, and Lexie's body is returned to Seattle . Still devastated by Lexie's passing, Mark advises his protégé Jackson,' when you love someone, tell them', which Mark felt that he never told Lexie enough when she was alive . Mark subsequently makes a clean break with Julia, stating that he had always only truly loved Lexie . Mark is soon placed on life support due to the extensive internal injuries he sustained during the plane crash and, as determined by his will, the machines keeping him alive are eventually turned off as he showed no signs of waking after 30 days . After Mark's death, flashbacks of several moments in his life showed him being videotaped at Callie and Arizona's wedding; at the end of his congratulations speech, Mark declares that Lexie was the partner he wanted to grow old and dance with at their granddaughter's wedding . When the remaining survivors of the plane crash pool their compensation money to purchase the hospital, they agree to rename it "Grey Sloan Memorial Hospital" in tribute to Lexie and Mark . </P>

What happened to lexie grey in season 8
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