You happen across a file on you boyfriend/husbands computer, you had a reason to be on his computer, but ended up snooping anyway (we all would if we had the chance). You find a saved IM between him and some girl on the other side of the country, which also happens to be where he is originally from. The IM is a dirty, webcam performance from what you read. It wasn't a recent chat/show, but it was about one year into your relationship and when she asked him if he had a girlfriend, he answers no.
Keep in mind that this is the only saved IM that you find and it is dated March . . . it is now August. You also happen to find pics of his "bits and pieces" saved in his pic files, as well as some naked chick pics. Do you care, and if so, how much? What do you do?