<Li> Susan Lewis (Sherry Stringfield) and Carter first met in 1994 when Susan was a 2nd year resident . Carter had immediately developed a crush on her . After her breakup with another doctor, he had tried to console her with a kiss but she had stopped him . She had then moved to Phoenix, Arizona, returning in 2001 . Once back at County the two rekindle their friendship and admit their feelings . They start dating but realize that the earlier spark is now gone, largely due to Carter's obsession with Abby . They split amicably after Susan tells him to "tell Abby ." </Li> <Li> Abby Lockhart (Maura Tierney), a nurse in the ER, and Carter become involved during Season 9 after Carter inserts himself into her relationship with Luka Kovac, leading to their break - up . After a series of personal crises, their relationship finally dissolves when Carter goes to the Congo for several months . He breaks up with Abby by letter . Carter cannot cope with Abby's unwillingness to make changes he wants, and does not propose, dooming their relationship . They remain good friends until the end of Season 11 when Carter leaves County; by the time he returns in Season 15, Abby has started her own family with Luka and they have relocated to Boston . </Li> <Li> Makemba "Kem" Likasu (Thandie Newton) begins dating Carter in Season 10 . A French / Congolese AIDS worker in the Congo, Carter meets Kem while working for Doctors Without Borders . They have a passionate, fast - paced romance culminating in Kem's pregnancy . At eight months, she loses the baby and begins to shut down emotionally . Carter proposes, but she does not answer and moves back to Africa . During their separation, they date others, but when Carter visits her while she is in France, they reconcile, and give their relationship another chance . During Season 11, we learn Kem and Carter have married but in Season 12 Carter is by himself as he returns to Africa to provide medical aid in Darfur and makes ominous non-specific references to how things with Kem aren't good . In the series finale, Kem returns to Chicago to visit the Joshua Carter Center, posthumously named after their son; she and Carter interact awkwardly and while she does agree to his idea that they'll fly back to Paris together . </Li> <Li> Wendall Meade (Mädchen Amick), a social worker in the ER, with whom Carter has an affair while separated from Kem during Season 11 . She ends the relationship with him after he admits that he does not love her . </Li>

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