The more you look at the phone bill, the worse you are going to feel. He is going to keep calling/texting the OW. He is getting "new" attention and he is eating it up. As with most things like that, it will eventually fade. Just don't do your part to chase him into her arms. I did the same thing...I checked the phone records and saw all the calls and texts. Ask yourself, does it matter? If he continues to talk to her, does it change your mind on working on the marriage? If it doesn't, then you have to fight those urges. Nothing good can come of you looking at those.
