I am probably going to get slammed for this but I do have one other element to add.
Boredom.....and the Thrill of pursuit... Now don't get me wrong I too am like Mike and John. I have had opportunities... I have had my ego stroked by women being flirtatious but that was and still is a line I would not cross. I am still married. But getting back to the thrill of the chase.... I think when you get married and feel sooo secure that your spouse would never leave you or stray you have put blinders on. This also makes your spouse feel they are in control.
A light came on for me today while reading some stuff about people and affairs. You see I believe my wife was perused by the other man... and yes she was not happy and vulnerable. When the other man got what he wanted. My wife became the clinging vine. They talked several times a day. I think the OM was not prepared for this. My wife became like Gum on his shoe... he was not going to leave his wife for her... he just wanted a trophy. This was not what he bargained for. Now I know every sitch if different but I do feel this is my sitch. My wife was too comfortable because I was like mike and john. Even after the affair was discovered. I told her I loved her and we could work it out. I became the clinging vine to any attention I could get. Wife did try a little but that threat of losing me never entered her mind. Until last Friday. Her light came on. So yes Bobbie being lonely is half of the problem but the other half are the people in the world that thrive on the thrill of the chase. Face it ..it does take two. My point is... you being lonely talking to this "dad" was part.... If he was a pursuer things could have gotten out of hand........
Doc
Sorry for the semi hijack
And if I claim to be a wise man, well It surely means that I don't know