Husband's texts

My husband was texting a mutual friend the other night and seemed really distracted. I got curious and looked at his texts and found that they were texting about a time when they hooked up years ago. He sort of joked about how he thought about it when he drinks, and then said that he liked when she did XYZ better than when I do it. He says it was not true, has apologized profusely, and says he was just looking for attention during a time when I was not really emotionally or physically available. I am now at the point where I've sort of forgiven him but I'm also still mad about it (I guess I don't really know how I feel) and I don't know how to interact with him. Sometimes I want to scream at him again or I want to be upset about it but now that some time has passed, it also feels kind of odd to me to be bringing it up. Just looking to vent here and get some feedback about the whole situation. I'm too embarrassed to talk about it with my mom or my friends.