My wife looks as if she has feelings for another man. How can I really tell?

Ask her!

Other then a feeling that you have,have you anything else to go on?

A little more information will help give a more detailed answer.

I also wonder what you base it on... could you give us some more details as to why you feel this way?

She becomes oddly friendly when a certain person approaches in conversation. I noticed that that particular person also changes in behavior and is more engaging. A passer-by would see that these two people were very good friends and think nothing of it and I would also except my gut tells me that there is something more... just can't put my finger on it.

I will approach her about it tonight and ask as I know that that is the best answer. I know I sound paranoid but I do encourage her to be more social and outgoing, however, I know what social and outgoing is and this is something I am not familiar with as far as the feeling I get when they get together. We have a very honest relationship and have been married almost 15 years. I have always asked is something bothered me but as I said before this just feels different.

Well, you know your wife better then any of us, so if your gut is telling you something is wrong, it might be better to just ask her about it.