my boyfriend and i were together for over a year on and off but he was an absolute sick but i couldn't let him go and he kept leaving me to go off with my best friend and coming back when he was bored and left me and came back and so on. but then he settled down with my best friend and both of us lost of relationships with each other. they broke up almost two months ago and then he went to another girl and another girl and now me. i couldn't say no cause he's always been the one i wanted but i knew exactly what was going to happen. it hasn't happen yet but he was all over my friend last night and ignored me and then acted like a dick when i got mad. i forgave him but then he didn't talk to me all today and he was at my friends house in her bed with another couple so you get where that's going. plus he talks about his ex all the time and she said she still loved him the other day and everything's gone down hill from there. it's happening all over again, but i can't end it because im too weak. he's my weakness. help?