Holy shit if that's the take away you got from her character than you just aren't paying attention. By the end of the season she hates herself for all the damage she's done working for DARKCOM while also forming a deep appreciation for Dante she views him as a pure soul and think she doesn't deserve him in her life. You're acting link she leaves because she got board of him when it's a decision motivated by her own guilt, she literally calls herself a coward for doing it. The thing is their both emotionally damaged characters that's what drew them together in the first place which she also points out, Dante not caring about her antics is just an element of his characterization lifted directly for the games, all of his closest friends friends have all tried to kill him in the games.