Ok obviously the time frames are a bit fuzzy and we don’t have the backstories but the way it’s presented it seems that mc got bullied ONCE and immediately tried to kill himself which is kind of hilarious
"All of a sudden?"
The MC purposely bonded with her and restoring her into a happier person with the SOLE intent of killing himself so that she breaks even harder. He's been a hot mess throughout this entire manga.
I’m really trying to figure out the deal with this MC. My best guess is this:
He develop an aversion to bullying to the point where he couldn’t stand it. So he tried to help his once bully. That lead him to be bullied again even though he still hates her.
Attempted suicide as one last hurrah, that didn’t work and now she’s the one who wants to help him.