Replies to 'Cheated On'

Where do I start? I met my husband when I was 14 and he was 16, I was pregnant 3 months later and we had a son. We went through so many struggles and finally after we entered our 20's things were really looking up we bought a house and were both working and our family was perfect....so I thought. After being in construction for about 11 years my husband finally landed the perfect job with a really good company. He had to travel alot and stay the night away ever few weeks. I had some signs but always new deep down in my heart that he would never do me wrong, he loved his  family too much. So about three months ago, he had purchased a new phone and gave me his old one. So here I was checking it out looking through it when I came upon some text messages from some girl saying " you say you can't see me any more and it kills me", so I ran outside where he was and was shaking and said "WHAT THE HELL IS THIS", he grabbed the phone and said it was a wrong # someone sent it to me and I never replied! Well I found a letter on his phone from this girl to him, and after crying and screeming he said she was a crazy girl and she liked him and he swore up and down, stupid me gave him the benifit and believed him. So after stress and weight loss and trying to move on, one day I was going through the history on thecomputer and found a secret email he had and it was so discusting, he was involved in porn sites talking to girls all over the world sexually and what do you know I found emails to his girlfriend. After even more stress and weight loss and crying and screeming he cried and said he was so sorry and he didn't know what he had until it was gone. He swears to be a changed man and calles me all the time, sends videos through his phone from places he is at. Yes I still check the phone records and the text logs. But I don't want to live like this I am so misserable. I've been with this man for 16 years and im only 31. I spoke to his girlfriend on the phone when this all happened and she had no idea he even had a family. When he was in her area he would take her to dinner and then to his room. He told me he was on an over night fishing trip when he was really out with her to a club and then to the hotel. He denied his kids! Cheated on me when I was pregnant! What kind of monster does that? He says he's changed but do I believe it, Ya I do. But I can't get over what was done behind my back. I am so hurt. I don't know what to do.