How can I begin to trust my husband again?

I am 26. Me and my husband met when I was 18 and short 4 months later, I found out I was 3 1/2 months pregnant. He seemed excited and told me he couldn't wait to marry me. Well, when I was 5 months pregnant I found out he was cheating on me and he seemed to think he did nothing wrong. We weren't married at the time. I broke up with him and didn't speak to him again until he decided to call me out of the blue one day when my daughter was 3 months old...which I had mixed feelings on. I was living in FL at the time with my mother and decided to make a trip to GA to see him and let him meet his daughter. This was APR 2000. Well, I decided to give him another chance and stayed in GA. In July 2000 we were married. Shortly after getting married, he would constantly be gone and not come home, he would come home with hickies on his neck, I found another female in his truck when I was 7 months pregnant with our son, etc. He denies he has ever cheated on me in the course of our almost 7 year marriage. How do I believe someone who denies what I saw, what I know happened? Why is it so hard for him to be honest with me? I have been completely and utterly faithful to this man. He is my heart, my world....but I can't seem to trust anything he says. When he says he's working late, I can't help but wonder if he is really off with another woman. I don't want to be this way, but I don't know how to regain that trust. When I try talking to him about it, he gets defensive and says it doesn't matter what he does I will never believe what he says. I don't want it to be like this. I am about to deploy to Iraq for 15-18 months. I am so scared I am going to come back and he is with someone else or he has been with someone else. He has given me a STD before when I was pregnant with our son...it just freaks me out. I don't want to divorce, but I don't want to live life constantly worried about him cheating again. Please Help.

Nope hun forget it. Take the kids to your moms and don't trust him. you know the answer already. He has never stopped and he's not going to. I went through it for over 20 years. Your ruining your life by staying with him. No one can make you understand but I hope you listen. He has never been faithful to anyone. I can smell his type. Men think with their pen*s and he gets mad because he is doing what you accuse him of! Please get out while you can. Doesn't it make you mad that he screws anything that looks better than you? It should. GET OUT!!!

I think you should reverse everything. This man will always have lovers besides you, because this is his nature. But independently from this, he can be a good husband and father. Ask that if he is a good man with this unfaithful nature - or not. If he is, then forget his lovers, if you find signs of them just laugh, and enjoy his company and kindness. If he is a bad man, independently of his lovers, then kick him out of your life.

'if one's not enough, a thousand is not too many.'

Thank you for everyone who has responded. Everyones advice has been helpful in some form or fashion. I understand life throws challenges at you and you can either defeat them or back down from them. This has been a major hurdle in my life and I feel I am ready to take it on with no regrets. He is a good father and a good husband when he wants to be. I have to keep in mind the well being of my children. Everything I do and everything he does will be mocked later in life when my children are grown...how healthy is that?