<P> Kurt begins to mend their relationship in "Thanksgiving", just before New Directions loses at Sectionals to the Warblers, and they spend Christmas together in New York City . Though he and Kurt continue to be on good terms, Blaine finds himself developing a crush on his best friend, Sam, which he knows will come to nothing as he knows Sam is not gay; the two of them team up to find evidence that the Warblers cheated at Sectionals, which means New Directions will be competing at Regionals . He ends up going to the Sadie Hawkins dance with Tina Cohen - Chang (Jenna Ushkowitz), who has developed a crush on him, but as friends only . When Kurt comes to Lima for the wedding of glee club director Will (Matthew Morrison) and Emma (Jayma Mays)--which Emma flees--he and Blaine make out beforehand, and sleep together afterward, though they do not resume a permanent relationship . </P> <P> Blaine had briefly joined the Cheerios when it looked like New Directions would be disbanding after their Sectionals loss, and cheerleading coach Sue (Jane Lynch) blackmails Blaine into rejoining; Blaine and Sam hatch up a plan to bring Sue down from the inside . Blaine eventually confesses to Sam that he has feelings for him, to which Sam assures him that he is somewhat flattered by Blaine's honesty and attraction, and that it would not change the fact that Blaine is still Sam's best friend . Blaine still loves Kurt and asks Burt for his permission to propose to Kurt, but Burt tells him they're too young to marry, and advises him to wait . Blaine remains determined, however, and while shopping for a ring, he meets Jan (Patty Duke), a lesbian jeweler who has been with her partner Liz (Meredith Baxter) for over thirty years . Jan offers to be a mentor to him, and Blaine and Kurt later have dinner with Jan and Liz, where Jan and Liz explain how their relationship evolved over the years and their experience with the growing mainstream acceptance of gay people . New Directions wins at Regionals, and Will and Emma get married immediately afterward, with the glee club, plus some graduates including Kurt, in attendance . Blaine is shown, after the ceremony is over, holding a jewelry box behind his back . </P> <P> In the season premiere, "Love Love Love", Blaine and Kurt agree to be boyfriends again . Blaine still wants to marry Kurt, and stages an elaborate and successful marriage proposal at Dalton Academy where he and Kurt first met, accompanied by New Directions, and all their rival show choir groups, including the Warblers . He auditions for NYADA and is accepted . New Directions comes in second at Nationals, and is disbanded by Sue for not being champions . Blaine graduates as class valedictorian, and then moves to New York to be with Kurt . They start off living together, but though they remain engaged, Blaine ultimately moves out because the two of them realize they still need their own space . The relationship between them goes through rocky patches, including Blaine's insecurity when Kurt becomes popular at school, and when an influential socialite and NYADA supporter hears Blaine perform and takes an interest in his future career, though she is not impressed by Kurt and ultimately tries to break them up, though she fails and ultimately supports them both . Their engagement is strengthened by having weathered these storms, and Blaine moves back in with Kurt . </P> <P> Blaine returns to Lima after Kurt ended their engagement, having become so despondent that his schoolwork suffered and he was cut by NYADA . He becomes the coach of the Dalton Academy Warblers, and begins dating Dave Karofsky after a chance encounter at the local gay bar . Kurt, having realized he still loves Blaine and regretting that he ended the engagement, arranges for his NYADA off - campus semester to be in Lima, helping Rachel to coach a reinstated New Directions--Will had left McKinley High to coach Vocal Adrenaline . Unfortunately, by the time he arrives, Blaine and Karofsky are already a couple, and there is further strain between Kurt and Blaine as coaches of rival show choirs . In "The Hurt Locker, Part Two", Sue, who "ships Klaine" and is desperate for Kurt and Blaine to reunite, locks them both in a fake elevator and refuses to let them leave until they kiss . After resisting for a great many hours, Blaine and Kurt share a passionate kiss, but do not reunite afterward . In "Transitioning", Blaine sings a duet with Kurt, "Somebody Loves You", and afterward, kisses Kurt . The following day, Blaine, knowing that he is still in love with Kurt, breaks up with Karofsky; however, Kurt is still seeing an older man, Walter . In "A Wedding", Kurt tells Walter that he is going to Brittany and Santana's wedding with Blaine, not him, and on Walter's advice, returns to Blaine; the two again become a couple . At the wedding, Brittany insists that Kurt and Blaine get married alongside her and Santana . Though skeptical at first, Kurt and Blaine agree and get married, with Burt officiating the joint ceremony . Dalton Academy burns down in "The Rise and Fall of Sue Sylvester", and the Warblers who transfer to McKinley are accepted into New Directions, with Blaine joining Rachel and Kurt as the coaches of the combined glee club . In the series finale, "Dreams Come True", after New Directions wins Nationals, Blaine and Kurt leave for New York, with Blaine attending NYU and Kurt returning to NYADA along with a reinstated Rachel . The episode jumps ahead to 2020, and Blaine and Kurt are shown to be actors and a celebrity married couple; they also visit schools to entertain and talk about acceptance . Rachel, who is married to Jesse, is pregnant with Blaine and Kurt's child . </P>

When do blaine and kurt break up in season 5
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