Glad that you didn't drink as you are coming up to three years sober.
I agree with Anna, a heart to heart chat with your wife is better than drinking. Good luck and I hope you both can work things out. I've been cheated on, a long time ago, and it wasn't a nice feeling. Fortunately I wasn't married and as a result it was easier to deal with (I basically ended the relationship) and there were no children to worry about or a house and finances to deal with.