Why some married men are UNFAITHFUL to their wives?

Can i know your opinions on my some men are unfaithful to their wives. Can you site some reasons why they are doing that?? All answers will be highly appreciated.

Based on my experience, i have met two guys that are already married but they what to court me. I am lucky enough to find out their status before thing can become complicated. So im just wondrin why some married men are being unfaithful to their wives and doing those kind of things.