Trying to Figure Things Out...

        I'm so confused. I don't really know what I want. I love this guy, but at the same time I knew what the consequences were if I got involved with him intimately. I knew this even when the opportunity wasn't there for the taking. I have so many questions in my mind about him. I want to know if he really means what he says when he said that he wants to see if we can become officially a couple or if he's just stringing me along just to have sex with as long as he can. Plus I want to know if he's still sleeping with his ex-girlfriend and wife. Yes, he's still married, but he's living somewhere else with a roommate and said they separated 2 years ago because she cheated on him. Within those two years is when he met his now ex-girlfriend (supposedly) that he claims he technically broke up with last July, and eversince, he says he's been trying to break-up with her. About 2 months ago when we first got intimate, I asked him when was the last time he slept with his ex, and he said two weeks ago! Then when he told me that, he said he was gonna cut off communication with her because he wanted things to get serious with me. But as a few weeks go by, he tells me that his roommate told him that his ex came to his house at 6am looking for him!!! What's going on with that? Also, I found an unopened letter from the mail that was from her. It was sitting on the countertop in his kitchen. Plus, he told me that she called him to ask him to come over his house and pick-up his things, but told him that she wouldn't do anything to him. These issues with her happened after he told her to stop contacting him. I wondering if he really did tell her that. I don't know if he's even still sleeping with his supposedly soon-to-be ex-wife. He goes to her house to see the kids 4 times a week to have dinner, and stays for hours. He tells me that he doesn't answer the phone when he's there. What is going on with this guy? Plus he calls me less now since we've been arguing at least once a week about his ex or him becoming more distant with me. He didn't call me all day the other day and now I'm worried if he's seeing someone behind my back. I also have a feeling that he doesn't want to be open and honest with me about everything like how he use to because of the fights. What should I do? I'm so confused!! PLEASE HELP!!