Need help with dealing with bad friend aftermath

I graduated from highschool a few months ago and two months after I graduated, I stopped being friends with a person whom I've known for about three years. While I was friends with him I introduced him to the club I was and the members of it, I helped him socially, I stopped him and his younger brother from fitting in with bad people, I gave him advice when he needed it and a lot of other things. I did my best to be a good friend but while that was going on, there were problems. Me and him didn't see eye to eye in a lot of things and he started insulting me, lying alot, blaming me for stuff I didn't do or blaming me for stuff that he did but he wanted me to take the blame so that he wouldn't suffer from his anxiety problem. Not only did he have that but he also had an anger management problem and a biploar disorder. I tried my best to deal with it but it kept getting harder and harder to deal with. He wasn't making a lot of choices and sometimes his choices would end up affecting me and it made it harder for me to study and stuff because I was busy dealing with that just so I could study and do my assignments when it was over. The two months after I graduated, I cut contact with him but I didn't block him since I don't block people on social media because I don't use it a lot and I thought his anxiety would hold him back from contacting me but it didn't . He accused of not being a good friend and thought I was a bad person. Normally I wouldn't respond to stuff like that but he had some mental problems that could become serious so I had to. When I was explaining stuff to him, K left some stuff out by accident and I don't think he understands now and since then Ive been kinda paranoid. I don't want there to be a day when he just snaps completely and tries to track me down. The guy also owns a YouTube channel and the last thing I want is hate from there. Basically I'm saying that I don't want any problems in the future because I failed to protect myself now. Hes still going to school but with some guy that's hard a grudge against me for whatever reason. The people I talk to about this tell me to move on and that I did my job as a good friend but I don't know. These past few months I've been debating if I should send him a message explaining everything then block him or just try to continue to move on. I don't want to make his mental state worse but I don't want their to be any problems in the future because I failed to fully explain everything.

If you have done what you can for this guy, then you should realize that there's nothing more to do. If your conscience is clear, then leave it be. Above all else, if you were a good friend to this guy, then you would have told him what he needed to hear, not what he wanted to hear. Move on and get on with your life.

Agree.