Trusting someone who betrayed me
My husband and I have been married a little over 2 years. He has been completely faithful to me until recently. About 2 weeks before Christmas he started talking to this other woman and became good friends with her. He did not however tell me about their friendship. I found out about their friendship on our December phone bill where I discovered 1900 text messages to and from a number I did not know. He told me about his new female friend and said it was nothing to worry about. He has just recently gone back to school and she is in his class with him so he told me they just study with each other. Even with him telling me this I was a little worried so I decided to start checking up on him online on our phone bill. I also did some snooping and found some texts talking about our relationship including our somewhat lack of a sex life. I thought our sex life was just fine since we were having sex a couple times a week but apparently he was not happy with it. I was also being nosy and got onto his Facebook account and found an exchange of some very sexual messages. When I confronted him about it he told me that he did cheat on me with this woman. He told me that they had sex one time a few days before Christmas but have not done anything besides talk since. He has agreed to stop talking to her to save our marriage and I have forgiven him.
My issue is I can not start trusting him again. I have been checking the phone bill, his email, and Facebook probably 15 times per day. I feel like I have an obsession with checking up with him. Is it wrong of me to do this? I have told my husband that I have been checking up on him and he really doesn't like it but I am honest about it. Should I be doing this or do I need to stop