Suppose someone said something to you and it offended you but you didn't know how to tell them...?

To quote you: "It's funny to me b/c he never calls me when his wife is at home." HUGE RED FLAG!

There is no reason why you cannot tell him straight out that you are offended by his overtures and that he should stop at once.

"This is offensive to me and makes me uncomfortable. Please stop."

And if he does not stop... tell him that his wife will not appreciate you telling her what he's saying to you.

Don't be afraid to speak up. You have a right not to be harassed by anyone.

I definately think the problem should be addressed, and it can be done in a nice way. You could have your fiancee' call him and say "Hey, if you would like, (insert your name here) and I can make you a meal and bring it over. I'm sure you're lonely while your wife's out of town, but I feel more comfortable doing things as a couple with (your name). It just seems inappropriate for the 2 of you to spend time alone. But we do feel for you and would like to help out any way we can".....He should back off completely, knowing what a strong relationship you & your fiancee' have.

you should get the hell away from these people before it blows up in your face