@DinoShortCakeTsukki
Damn, I found you since you replied to my comment and thought that I should check you out. I have similar situations with you. Eversince he asked me to date him but I didn't like him like that yet I couldn’t say no since we were friends for a while and I didn’t want to disappoint him. He did a lot of things to me and it affected me physically, mentally, emotionally and physiologically. And whenever I try to leave he would threaten to kill himself which made me insane. In the end I left him since I was draining and I'm growing up.
What I recommend is that you NEED to talk to me him about it. Be honest about your feelings and tell him that he should find someone who loves him as much. If you want, ask him if you can still remain as friends but of course, it's okay if he doesn't. Give him time to think about it and try to be there for him since it will affect his mental health greatly.
But then, you NEED to tell him. I promise it will be mentally draining enough if you just kept being with him.