I asked her if the was OM, and she said if there was she would be with him. She tells me all the time she doesn't consider us together anymore.
I don't know how much more she could plainly draw a picture for you. Sure, you continue saying you don't believe it's an affair.......but have you ever heard of self-denial? She tells you it's over and will be staying with the man she recently met for the first time.......and she doesn't even want her baby b/c he's inconvenient. Is there a particular reason you have for not seeing what is in front of you?
Let me tell you a true story. There was a couple that married and then split up pretty quickly. However, she was expecting a baby girl when they broke up. Sometime during that little girl's teenage years, she discovers where her daddy was living and leave her mother to go stay with him for a while. Well, long story short, they did not have the "natural" parent-child bond. To that man who had never seen her or make contact with her......she was a pretty, young woman living in his home. The story ended with them having an incestuous relationship.
I can see the same scenario with your W and her half-uncle who is her own age. They don't feel like family b/c they never knew each other. If it was some other guy, would you stay home and raise the baby alone, while your W went to stay with him? Would you tell her you don't want her thinking she's not welcomed back? I mean, she plainly told you if there was another man it would be him. She is not the first woman to go to a "relative's" house in order to get closer to the man.
Have you met him and his wife?
What are the ages of you and wife?
Do you have parents or siblings? Any family living close by you? Why did you spend all that time at her family's place?
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!