I have been married over 15 years, have children, and have never had any marriage issues. My wife works in a fairly stressful and demanding job. For most of our marriage, she has worked exclusively with other females due to the nature of what she does, until a few years ago when we had to relocate and her work partner happened to be male for the first time. The nature of her job requires a close working relationship with her colleague and a friendship has blossomed between them. He is roughly the same age, married, and has children as well. She has always become good friends with the previous female colleagues due to the nature of what they do, so it would only make sense a friendship would evolve based on prior experience as well as them having a number of common interests based on their occupation. I have met this man and his family and we have all been out together periodically without issue. He seems very nice. Although I do not believe that anything has happened between them on a physical level, I believe there is a fair amount of emotional involvement based on their circumstances. They text each other periodically outside of work, but not excessively. Nearly all of the time it is work related, but can have an air of playful banter between them on occasion. They will sometimes refer to each other as an ass, dude, ****, etc… while discussing their work. There has never been anything sexual whatsoever, other than this mild name calling and teasing back and forth. They do not call each other much outside of work and when they do, it is always work related. She has even suggested to me on occasion that I become friends with him as I would probably like him. There are no typical signs of an emotional/physical affair that I can see other than them being close friends due to their close work environment. They really appear to be colleagues who have simply become good friends because of how much they have in common. The problem I have is that she seems much more playful around him than with me. I see how they interact on occasion and the playful nature of their communication just seems too familiar and too comfortable for my liking (she laughs hysterically at his jokes). Is it normal to feel this way simply because I am a man seeing his wife have fun with another man and provide friendly attention between each other? I did confront her on one occasion and advised that I needed to understand the mechanics behind their friendship as I was feeling a bit jealous of how smitten she seems to be when she is around him. She simply said that I had nothing to worry about, he was like a brother to her, and that she is glad to have him as a friend. He makes the stressful work environment easier to cope with because of his crazy nature and understands the work related issues she has with the job. So… there is no evidence of anything that I have been able to find relative to a true physical or emotional affair, but my gut can’t seem to let go of this nagging feeling that there is more to the picture based solely on their playful interactions with each other. It really bothers me that they get along so well. And for the record, I have not found anything via text, e-mail, phone, facebook, etc… that would indicate there is a physical or emotional affair between them. Am I selfish and wrong to feel this way and is it merely me being insecure and over protective of my marriage? It’s just getting old with the kindergarten recess mentality with him and the back to reality home life with me… Any help would be greatly appreciated as this is eating me up inside.