Responses

I guess just not being there for mitsuya when mitsuyas life was basically falling apart becuase of his dads business not doing well and his mother leaving. Abe probably felt too ashamed to stay friends with Mitsuya since his other friends were gossiping about mitsuya. Abe just ended up ignoring Mitsuya which obviously made mitsuya angry and betrayed. Hopefully that made sense
Mitsuya is the definition of self hate. Sure. He is kinda an ass, but after everything he's been through you get to understand why he became so twisted. But he's still an ass. I don't absolve Abe for his mistakes in the past but y'know he tried to become honest and wholeheartedly tried to reach out his hand to mitsuya. But I guess that's how it is. We can't save people, Abe. We can only try to help them. So I understand the feeling of betrayal Abe has rn.