If he has trauma connected to being a exorcis , it’s completely reasonable for him to not want to return to that life.
Having trauma is one thing but the so called trauma is legit i don't wanna take my brother place which is valid reason for not wanting to be an exorcist but not really traumatic per say since legit no one did shit to him other than wanting to make him the head ( at least not shown or implied yet)
He doesn't owe her friendship or mentorship just because she wants to follow the same path and is lonely.
at least he owe's her and more of the way he did he knows she is a loner and class and she told him about what happened and even his family noticed how she felt and not wanting to be friend with her is one thing but acting like an asshole just to push her away was his choice there was plenty of ways he could've even take his time a bit and make her give up in a better way even become friends for a bit and not be an exorcists but this was his choice
And
ignores the fact that he offered to take her to the place where ability users can learn and train, and is trying to find a proper guardian for her.
this offer is valid but had he dealt with her better there could've been a way like he could've refused and gone with her another day he put himself in this trouble himself and now wants out in the worst way possible the city center can be visited again and she cant just put his name alone without him approving that is not how it works in almost anywhere
Someone having trauma, loneliness, depression, or other mental-health struggles doesn't create an obligation for another person to become their friend. Friendship that exists because someone feels morally obligated to provide emotional support can become unhealthy for both people.
dude legit other than said so called trauma about not wanting to take his brother place dude didn't have anything not even boredom he was living his life and even enjoying it i dont know why mentioned something that has nothing to do with this as example when it is not mentioned anywhere that he is dealing with anything other than him not wanting to take his brother place which keep in mind he can still refuse now that he is older .
also i would like to add what about HER trauma this is the first time she found someone like her since she was a child who everyone assumed was crazy
(see next chapter) and yet the moment she found someone like him who gave her a bit of kindness after finally she was not alone she would latch onto him like a baby duck unlike him who has known this world since he was a child she didn't, and she knows him as a classmate who is of the same age and found her of course would want him instead of a stranger.