@sintas22 nah man, both he and his friend are a mess in a different way. His friends way to cope is by being asshole while the mc being like the mc we know now
@Bariq129 as you said its his way of coping but the dude knows his action but can't take reponsibility about it...he mess up the teach but can't face her himself...he is so ashamed of what he did that he need other to talk for him thats no excuse
I don't understand the student-teacher relationship either. But, @Starbright (if I interpret correctly) I think the teacher was seriously worried about possible suicide, but that send to be based on a story (lie) from/about the friend's past. She's understandably angry/pissed when the mc points out the lie, hence the drink.