I'm sorry.

Sounds like it's definitely time for counseling, both individual (for you, at least, even if he won't consider it) and marriage, if he will consent to go. I suspect he will not go, but please consider it for yourself so that you have some clarity when you make your decisions.

Think hard about what you will really want if you find out he's been cheating. You do not need to act too quickly (as I did when I found out about my husband's affair).

And is there any way that you can go to Las Vegas with him? (I don't want an answer to this; just putting it out there so you can think about it.)