Need outsiders prospective, please...?

The man that I have spent the last five years with has put me through total hell. We have a four year old child together too. In the beginning he had a drug addiction that I didnt know about until I was pregnant, abandoned, and my bank account was overdrawn by nearly a thousand dollars. The next two years was more of the same over and over. Id forgive him and take him back only to lose money, vehicles, and at times, my mind. I, at one point wanted to hurt him back, so I slept with his brother, he went off the deep end. He went on a two week drug binge and ended up in jail and the conviction sent him to prison. He spent three years in prison and I of course forgave him and he forgave me and I waited for him. I waited for three long years 100% faithfully. We became friends for the first time in our relationship. I took care of any and everything he needed, visited him (with children in tow). I did his time right along with him every step of the way. He says he loves me more than he has ever loved anyone in his life. He said he wanted to adopt my other son from a previous marriage and let him call him Daddy. (My son, to this day still thinks this guy is his dad). After three years, he is released. We had tried to get married several times while he was incarcerated, but it never panned out for one reason or another. So we settled on getting married in Oct '10. He was released Jan'10. When he came home, I was so afraid of him getting back on drugs, I was very controlling. Life at home was miserable. Plus he was having trouble finding a good job that I was carrying the financial burden of another person to care for and I do not have a lot of money at all. We were strained. So in his usual fashion, he chooses to run away from the problem instead of dealing with it. I discovered that he had cheated on me. He had been home for three months and cheated. I was devastated. I packed up his stuff and he didnt try to stay, he said he wasnt, but I knew better. Five days later I see a pic of him and her on her facebook as her default pic. I imediately changed my number and started talking to other guys. I did see and kept occupied with other men the whole time we have been split up. I have not been able to get him out of my mind at all. I have not been able to allow any man that I have seen to get close. I have been completely miserable in spite of my best efforts to get over this. During the first month of our being split up, his cousin got my new number and two days later I started getting private calls in the middle of the night and this person would just sit there and I eventually started to talk and they would still just sit and listen. Anyways this brings me to my current situation. It has been seven and a half months, he calls me up and wants to see his son all of a sudden. ( he hasnt tried to contact us all this time). During this first phone call, he admits to me that he married the girl he cheated on me with. He knew her for two weeks when we split and he moves in with her. He says he proposed three weeks later and less than two months of knowing this girl, he married her! He said his whole family tried to talk him out of it and they told him he wasnt ready. THey were mad at him for what he did to me. They love me and they didnt really like her. He says he left her and he isnt going back. He said that he doesnt love her and never did. He cant tell me why he married her or even why he left me. All he says is that he was weak minded and he lost his mind and that he is trying to be a better person and make it up to me and my son. He says he isnt trying to get me back just that we should be friends because of our son. But then he says he still loves me and never stopped, that the whole marriage thing was him running from our problems, wants to know if he offers me money will I take it, can he take me out one night as friends. He also knows everything I have done the whole time we have been split (facebook). The two times I have taken my son up to see him, he tries to touch and kiss me. I know I have given him enough chances and he has blown each and every one. I have suffered unimaginable pain over him. I can believe the marriage was a sham, as he always does something stupid when we split up. Well I got real stupid, and the last time I took my baby up there, I agreed to stay the night. I ended up sleeping with him. I was hoping he would just treat me like a piece and I could move on, but he didnt. He did things that he didnt even do when we were together. He held me all night, played with my hair, kept touching my face. I would wake up and see him staring at me and brushing my cheek like I was precious to him (WTH???) I dont want to give him another chance, but I am so love sick right now. Can someone offer some prospective on him and his behaviour. I asked him and he doesnt know why we cant stay away from each other either. And Im still pretty upset over my older son who has now lost two dads.