Suicidal Boyfriend

My boyfriend is the love of my life. I can't imagine leaving him but I think I should. He's become so suicidal because I slept with guys because they wanted me to. I used to hang with the lowlifes. He's so angry that I have myself away to guys that used me and left me. One time a guy literally left me on the side of the road after I had sex with him. I love my boyfriend but I don't know how to help him through this. Should I stay or should I go? Any ideas on how to help him get over this? I'll take any advice that y'all have.