Oh, good! She's coming across just as you'd like, then (PTSD, OCD, depression and all). Carla is also just... basically everything that freaks Justin out rolled into one person. He can sympathize with the mental issues, but he really doesn't like unpredictability and likes physical intimacy even less (comes with the prison bitch territory). So in a way he's drawn to her because she's fucked up in a way that he vaguely understands, but he's also deeply uncomfortable around her.

Justin is so thoroughly superglued together that he might not break, but he may try to be boring.

So charming, Delacroix. Chekov is very fond of you and your grumpiness.