He's gone, he travels for work. my wife has been acting normal.So, this was related to you by your friend Shawn? That had to be an awkward conversation. At the time you made the bet I'm sure you were confident and didn't feel the threat of losing. Shawn is interesting. He said he felt bad afterwards. I wonder if he felt bad for doing it or bad for you because you were so sure your wife wouldn't be tempted and she failed, or both?
Is Shawn gone now? Will he be back? Has your wife said anything about it or acted any differently since? You know that if you mention the "bet" between you and Shawn your wife will probably be upset with you. She'll think you set her up when she was vulnerable from drinking. It must be hard to keep what you know to yourself.
Turning this into a net positive will be tricky. It may be best to sit back and take in information for a while. See how she treats you. See how you treat her. Both you carrying the knowledge of what has happened will not fade away. Find a non-threatening way to discuss sex with her and see if you can get it out in the open. Your best chance for you both to enjoy it will be if you're honest and open with each other.