Hello there guys;
So, as it happened...
We are living as a joint family with my parents and brother; We found this cousin who we can share our family and work related issues;
What happened over time was he became more important than me for my wife, as he was giving advice and supporting us on various topics; and they started to talk different somehow his wife is totally detached from him and same thing started to happen to me as they started becoming love birds while I was left on the sideline watching them. They were saying it was just a friendship for a long time and I did not want to be the bad guy.

And, seeing my wife being lost to another man I asked her to stop contact; and than there was resistance and that's when she said that she has wasted 10 years of her life staying with me; she said that he puts more attention and effort than you did in 10 years with me and after some conversations the topic of love comes out and somehow she has fell in love with him.

She said that she did nothing wrong and it was only emotional connection she had with him and I have made her lose best friend.

Biggest question from this whole adventure is making friends and getting involved with out side people; it seems I supported my wife and attended all the events and did everything she asked to make her happy but this almost destroyed my home; So, is it bad idea to do all the events and activities with one family? How can one know if their relation is safe from outsiders?