Hello Wreck!
When you take a flight from L.A. to New York, you expect a smooth, eventless flight. When you turn on the TV you expect a clear, perfect picture. But when you tie up with another human being, a person who has different ideas about life, someone who comes from a different home and who has different life experiences, you can not expect smooth sailing.
Relationships are difficult because the initial attraction, the first glow of "love", does not last. It will fade with the everyday routines. On top of all that, a man's sexual appetite is far different from a woman's. In most instances his needs will outpace a woman's through most of his life.
This said, I do not approve of philandering. But you do not indicate that you were married to this man. Not that you would have fared much better in marriage. But consider this: marriages last far longer than shack-ups for the simple reason that divorce is an ardeous affair. For the man can not simply walk out. He faces some legal responsibilities.
Join a group that gets together on a subject that interests you. There are millions of men that enjoy a lasting relationship. Go to my website - compatible - and check out Marriages, Shack-ups and Other Disasters to find out what relationships are all about. And, please, forget about this guy.