I have always thought that it calls balls/guts to kill yourself, especially if you're jumping off a tall building.
If you have that much determination, then how about killing the bully(/ies) instead? If the person is not expecting, it is very easy to kill them, with a carpet knife e.g. .. You get out of the jail eventually, and can then start a new life.
(a lot better route anyway, than being pathetic one by jumping off the roof, and enabling that asshole of a bully to continue his ways/life)
Besides, when the bullying is done by pressuring him being a servant like that, then you as the victim are enabling it, by doing also an active part.. I just don't get this mc. There are so much more choices and different routes to try first, before suicide is logical. (And even then, you should kill the bully first. Take the bastard with you, and maybe even earn good karma doing so before dying)
He should've used that determination to improve his physique, by going to the gym, and along that doing martial arts etc. and eventually beat the shit out of that guy in front of everyone. Even better, make sure the guy stays in wheelchair for the rest of his life, cripple the cunt. (I'm giving some great tips here, and even for free!)
I get that by shoving him trying to suicide, is to show how severe the situation was, but I think it also made the mc look stupid and illogical. Imo him suiciding wasn't necessary for the plot (but that's just my opinion).