Suicide

I was with my ex for 2 years. He's my best friend and I moved in with him right after my high school graduation and spent every day with him. 
He has a temper (never laid a hand on me. But would say some very mean things to me and blamed me for everything). But other than that, our relationship was good. Sex was great. But he didn't want to work, wanted nothing to do with my friends and family and never wanted me to do anything. I was the only one working and he would spend my whole check every check. I got behind on all my bills.
 I finally got the courage to move out and leave him. I didn't cut ties with him bc some of my stuff was still at our place and he owed me money. Shortly after I left he told me he was going to kill himself. He attempted to a few years back and a friend had found him. Now I'm finding myself falling into his trap and I don't know what to do. 
He told me if he does kill himself that he wants me to live with the guilt the rest of my life. He thinks I'm coming back to him but I can't do it. I'm not going to be happy. But I can't bring myself to break it to him and him end up hurting himself. Please help me 😢