What should I do because I hurt him?

I broke this guys trust. Now he's trying to say the stuff he opened up to me about was a lie. He's trying to tell me he doesn't care and he wants me to leave him alone. I know that's a lie bc when I betrayed him he stayed home from school. He also sent me a pic of his puke and said are you happy? He walked by me one time and he looked sad. My friends said they saw him crying over me twice. All he wanted to do was make me happy. He said to me nothing he does is good enough and maybe if he killed him self maybe it would be good enough. He even posted this on Instagram : nothing I hate more than chasin after someone bc I always end up feeling like a idiot so when I act different towards you don't wonder why. I feel bad for hurting him. I never hurt a person this bad. What can I do