Fuckboy non fuckboy, get it?

Here's how to comprehend. We started as friends and quickly escalated into something physical. We have been doing almost everything of what a couple consists of, just haven't made it official. We haven't met each others family, but know everything about them, we live in a small town so when we go out to dinner we drive about 45mns out during weekdays only. He says he has strong feelings for me but is not ready to settle down again (he is divorced). He knows I have strong feelings too but 5 years into this is getting to be tiring for me. I just found evidence of him seeing a girl from out of town(6hrs away), how do I confront him without looking and sounding like a psycho about how I came upon this evidence??