Kinda a Thing???

I've recently started hanging out with this guy and we are not exclusively dating. I know he wants to, but I've told him I can't right now (Im still in high school and I'm loaded down with college applications and homework along with sports not to mention I have a rocky past with depression and self harm the last thing I need right now is a boyfriend) and he agreed that we were just friends. Recently I've been a little mentally unstable and haven't been texting him or anyone and HE IS BLOWING UP MY PHONE and I can't deal with him. Should I just tell him to shut up? I don't know what to do because I do like him but he is the last person who will get what I am going through. I just need him to back off for now, to stop texting me and always trying to talk to me I'm just overwhelmed.