I need some advice about my boyfriend?

Well, I was pretty much in bad relationships my entire life. When I was 16 until I was 22 I was in a relationship with a guy who abused me physically and emotionally, he lied and cheated on me, and got me into a financial mess. I did a year of therapy and tried to get my life back, but I was insecure before and this beat me down. Then I dated losers and the other relationship I was in he cheated on me. Well, it makes me wonder what is wrong with me. Well 8 months ago, I met this amazing guy.He was good looking, funny, sweet, and we have so much in common. I have never met anyone like him before. We live an hour apart but we try and see each other as much as ppossible. I stay there prob 4 nights a week. He really acts like he cares. He comforts me when I am sad, he won't let me pay for everything, he pays me back if he borrows money, he just treats me like no one else had. He loves to just hug and hold me. My aunt recently died and he held me all night, called to check on me, he offered to go with me to the funeral, but he sat there and just talked with me. He was great. He always is. My problem is that I'm scared. My mind tends to wonder and I go crazy. We don't fight but one night I went nuts. He tried to calm me down but their was no rationalizing with me. I was drunk and trying to break up with him. He said the nicest things. He told me how amazing and wonderful I am. He appriciates me and all I do for him. He may not always say it but he does. He swore he wouldn't hurt me. He says he doesn't know who ever told me I'm not great but that's a lie. I am pretty and he loves me eyes. He said I was trying to run bc I've been hurt and I'm scared and so has he. And just a ton more. I stayed that night. I recently tried to leave him again and he tried to calm me down. He said nice things and just wanted us to talk. I said we don't want the same things but he said if I want to move he will move. He would have kids if I want. He isn't worried about our religious differences. Well I kept saying he just wanted sex and he was cheating. He denied both. He calmed me down and I felt like it was so right again. There are times I can't imagine life with anyone but him. I really do care but I don't want to get hurt or make the wrong choices again. And there are days things feel off. We met online and I discovered that he is still on the online dating sites. He doesn't check them a lot. So this always had me wondering. Is he cheating? Will he? does he want something better? Well when I saw this I felt insecure so I check his phone occasionally over the last few months. Most of the time its nothing just his parents, me or his buddies. Occasionally he talks to this girl but nothing serious. Its nothing more than a few texts usually and its nothing suspicious . And I know online sometimes he talks to girls. Recently I found some girl sent him pics nothing to bad but I was hurt. He talked on the phone with her that same night but never again. I don't know what to do. I confronted him last Monday. Actually I just left. He and then I confronted him when he kept calling. He wanted to talk and I wouldn't listen. I kept hanging up on him or ignoring him. For 2 hours straight he kept calling and texted me. This was the first time he told me he loved me. He was hysterical. He was in tears and it was bad. Finally I gave him the time of day and listened. He said he was scared and thats why he did it. He never did anything. I am the one he wants to spend his life with. He sees me with him in 10 years, in 20. He sees me having his kids. His mom loved me. I said what am I not good enough. He claimed I am the best and wouldnt find any better than me. He swore he was just scared bc I am like his 2nd gf and the first long relationship she hurt him. I finally after another 30 mins of appologizing and crying and begging I went back. He swore it wouldnt happen. So a week goes by and I find messages from 2 of the woman he spoke with in the past. And they were messages sending pics and not just hi how are you messages. He never mentioned a gf. This broke me. He flat out lied to me basically. He said he wouldnt do it and did. Should I dump him? Why is he still on this dating site? How do I know I can trust him? Does he think I'm not good enough? I wish I felt secure. I wish I didn't feel this way but what should I do? He swore he isn't cheating and won't hurt me but how do I know that's not a lie? I dont get any of this. I need some opinions please. If people think I am overreacting I think I can move past it but I need to know. My one friend thinks I am overreacting. She says he is the best thing to happen to me. should I confront the woman? what do I do? I am a mess and need advice.