My Wife And Her Friend

My wife and I live in separate states. We have an excellent relationship.

However, I worry about this friend that she has. He is married and has a child and one on the way.

I have met him and he's a great guy. My wife and him have been friends for years and they are very close.

Tonight he was in town and they went out for dinner and a sporting event. Then they went back to his room to hang out and have a couple of drinks.

I am worried about this situation and what it might entail.

Should I be upset?