You don't have to come into the thread and be rude and personally attack the OP. A few of y'all need to learn how to communicate better and stop being so disrespectful.
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I completely understand where you're coning from. I was like that with my boyfriend. His past bothered me, and then he would always talk about it. And at the time we were talking and trying to work on our relationship and start it off right, he went and had sex with his ex and told her he loved her. It bothered me for awhile, because I felt like he would easily just move on from him and go to somebody knew simply because of his history, but as time went on, he showed that he was faithful and caring and that's all that matters. As long as your boyfriend is completely honest, faithful, and loyal to you, then his past should be led behind. Don't let it ruin you're future. If you're still bothered by it, you should go talk to him and tell him how you feel and clear the air.