Cheating or not

I found out my husband went out to see aovie yesterday afternoon with a female coworker. I was at work, and tried calling him on my lunch break.. ( he later told me that was napping-LIE). After i confronted him. He claimed it wasnt cheating. Just wanted to go do something fun. He said they paid their own tickets. And after further prying, i found out that they shared a popcorn. ( which, i meam, seems intimate )he did all this behind my back. ALSO, the only reason i found out , is because another one of his coworkers told me....