HELP! I am addicted to my boyfriend and it is controlling every asepect of my life?

I'm afraid he feels trapped. If he threatens to leave after a fight, I threaten suicide and have actually tried it several times. I get into a hyseterical frenzy. A while ago, he heard that I cheated on him and got very upset. He got togehter with this horrible girl (druggie and thief) and they slept toghether atleast 10 times and she even stayed with him for a couple of weeks since she doesn't have a place to live. That was the worst month of my life. I couldn't stop obsessing about what they were doing. I couldn't stop crying. I really wanted to die. I really do love this guy but part of me wonders if he is an addiction. I am also a serious recovering drug addict and alcoholic with many emotional problems. Other guys show interest in me that would probably be able to take care of me but I am not interested. This guy doesn't work and sponges off me and my Mom. I've been buying him weed as almost a bribe since he is very addicted to weed. I really need help and quickly.