Almost every single guy I've ever dated has cheated on me, and as I've gotten smarter from these experiences, you start to notice little things [like what the computer history says vs. what he's telling you]. I lived with another guy I thought I was going to marry at one point, who used to wake up in the middle of the night and surf sites like adultfriendfinder.com or get in touch iwth his ex. He told me I was invading his privacy. Computer history doesn't lie, neither do call logs or text messages in phones. Every single time I've approached a boyfriend, and even my husband, about something that I was either snooping for or accidentally fell across, I made sure I did my research first to have hard evidence to support the angle I was coming from. I would do the same thing you did. Who's to say he won't do it again?When you really think about it deep down inside, it's healthier for each of your kids, you and him to hash out these problems now, before it's to the point where it can cause even more damage [think of how your kids would react ten years from now]. No matter what decision you make, I'm sure it'll be tough, but when there's little ones around, you really need to plan for the future- even if you're the only responsible parent doing it!