Thanks for all the input it was helpful. I decided that regardless of the situation I wanted some explanations on what really happened. She explained to me that it started and remained a friend thing only. PAlady said it right they would just talk about anything and it would sometimes make her feel better. ALthough she says she has been feeling down for a while but didn't want to tell me for several reasons, it has been her upbringing that the a wife should not bother the husband with all her concerns (I know it is old school from her mom) she was afraid I would think she was weak and wouldn't understand. I told her I want her to be my equal in this marriage and that she can tell me anything. Slowly we have been talking about things we have never discussed before. Prior to hear telling me about this guy and based on some of our previous conversations she started to realize if was wrong and felt guilty she cut things with him approx 2 weeks ago but not telling me for a while made her feel guilty and thus worse. This weekend her spirits were much better. I guess for now all I can do is support her and keep my eyes open to see if I notice anything out of the ordinary. This situation is by far the most difficult I have ever had to face.
Thanks for all the input.