In mid-life the man wants to see how irresistible he still is to younger women. How they turn their hearts to stone and more or less commit a murder of their marriage I just don't know but they do.
Marriage is something that needs to be worked on every day. I don't know if I'm the one to give marital advice since I've only been married for a little over a year but marriage is certainly easier if you are open trusting and loving.