Oh my god, this is quite interesting. At first i thought it would just be just another overused love triangle where the obligatory childhood friend character has the first-class ticket to Loserandia.
Then it changed into "i help you and you help me" trope but they will gets closer to each other, which is one of the trope that i love.
Honestly his trauma is one thing but the girl in question doesn't hate you and in fact loves talking you. Why would this interaction with her make you think she hates you?
Like I'm trying real hard to not shit on this guy's reasoning but it's like "bro you're making it too hard" at least he's aware how pathetic it is but said girl in question still seems to act the same as she did in your childhood. She's fine (save for the overthinking clinginess on her part).