I think it depends on how you look at the situation. You may consider it a form of cheating because he lied, had another girl touch him, and all of that. But maybe he was drinking, his buddies persuaded him, maybe he wanted to know what it was like, maybe it has something to do with yours personal sex life? Perhaps you should try a different path with sex, maybe arouse him more, make him want you in a way other girls can't offer him. My boyfriend recently went to a strip club, but he told me their were no dancers. I trust him, but I doubt there were no dancers there. Tell him that it made you sick to your stomach thinking of him getting a lap dance, if you're still together try to work it out, and explain to him how he's your one and only, and how if he's thinking of others girls he'd rather be with than you, step up and say it and be a man and admit it, rather than lying and creating this bad situation for everyone.. Hope this helps! Good luck!

~Maddie.