User blog comment:Toadgamer80/TDR Userboxes!/@comment-3350823-20110910195112/@comment-1874924-20110911005932

How could he cheat on such a pretty character'?

One answer is that guys have a polygamous streak by nature. I don't remember who said it, but here's an applicable quote I encountered not all that long ago:

"Show me the most beautiful woman in the world, and I'll show you a man who's tired of sleeping with her."

Note that I don't condone cheating--I understand it, which isn't the same thing.