I have been married for 27 years, we were seperated for 4 years & got back together January, 08. I made the m

I have been married for 27 years, we were seperated for 4 years & got back together January, 08. I made the mistake of reading my husbands emails, & found that he was taking another woman to lunch on a regular basis. It is not that I mind him taking a woman he worked with to lunch, what I didn't like was that he would tell her in his emails how much he missed her, how he needed to see her. After one lunch he told her he didn't want it to end, he didn't want to leave. He looked forward with great anticipation seeing her, he wanted to enjoy having lunch with her and not be in a hurry its pretty obvious hes attracted to her, today he told me that at one time he was. When we got back together I told him I needed him to stop these lunches, if he didn't our marriage would be over. He promised not to see her, WELL HE DID last week. It is not that he has lunch it is the fact he has betrayed me,He never tells me what he tells her, he never takes me out. Am i wrong to be hurt? What about trust