T, Not surprising at all. Don't expect any morality or conscience now - WAS such as these did not have much of this since a long time ago. The sad part is the children in the middle.
By the common laws of 'live and let live' and 'everyone does this' so 'time to move on' you could go find a 'sweetheart' and justify it, but I seriously doubt that makes things right for you or your kids. To me this seems like the behavior of stray dogs that smell their way to their next sexual encounter. I'm sure most won't agree with me but that's just my view.