Y did he say not to talk to him??,?

( more info read my other questions) all I was trying to do is help him. Hes depressed so I thought I'd let him vent and we could have a good conversation. But he said " I'm sick of everyone... Leave and don't talk to me for a while!". I'm really offended.. Y would he say this? Btw we r 15. ( read my other questions for the reason what I was gonna help him with). I feel like he doesn't like me any more.... Again... Y would he say this?!?!?!?!?