I still love my ex should i get back together with after what happened between us?

i have dated this guy twice now and i very much have deep feelings for him. The first time we dated everything was perfect until my ex fiance came in the picture and told me he still wanted to be with me and kissed me and when i told me boyfriend a week later because i was to scared to tell him. he was mad i waited so long and broke up with me for keeping a secret and lying to him when he asked what was bothering me during that week. he started dateing another girl to make me jealous and later on that month he started talking to me again telling me how much he still cared and wanted to be with me and since i still cared for him, i agreed to go out with him again. he broke up with the girl and we started dateing again but i didn't feel secure after a few weeks he was always texting and wouldn't let me know who was texting him. i told him i wantedto know if he was talking to other girls like he did when he dated the other girl, and if he wasn't then all he had to do was say so because i wanted to get over my insecureness. well he made a big deal of it and said i was accusing him of cheating and broke up with me because apparently i hurt him. After a while he started dateing this sluty ***** and she had him convinced he cared for her and slowly he started talking to me again first as friends and then getting more serious. I stayed with him one night at his work house and 2 days after he found out the other girl had been cheating on him with my ex fiance and was pregnant with another guys kid. she somehow convinced him to stay with her but when she wouldn't stop talking to my ex fiance he started comeing to me tellin me he was going to break up with her for me. the girl had a miscarrige with the other guys kid and when he started to tell her they were over she told him she was pregnant with his kid and loved him. so he stayed with her for the baby and because he didn't want to ruin anything that they could have but she was still talking to ex and then broke up with him to be with my ex fiance and thats when he was mad at everyone and anyone that he cared for and told me he didn't want to talk to me. i figured he would call when he got over everything and i tried moveing on by dateing other people but this didn't work and when he called the other week wanting to talk to me and be friends again i told him we could talk when i came bak to town to visit. So i went and talked to him and he is saying he has no feelings what so ever for any other girl and he still loves me and even when he tried not to it didn't work and he can't stop thinking about me and where we would be right now if my ex would have stayed out of it to begin with. and how he wants to get back together and be with me. he says he has changed and is a better person and is smarter. i trust him when he says all this because he isn;t one for lying. i still love him but i'm scared to get hurt again. i also know that most couples don't make it if they have broken up before but maybe we could. i just would like some othe oppinions i know it's a long story but it's confuseing and i could use the extra view point. Thank you for any advice you can give me. Oh and if your going to say something mean please try and say it in a nice way if you could. thank you