At least she didn't screw your best friend before filing for divorce! (ask me about my ex-wife - I dare you!) Keep your perspective, Ed. Women aren't something that can be resolved or figured out. That assumes that they're simple and rational.
I'd offer lots of advice, but Andy W. seems to have hit the nail on the head. The best ones show up when you're not looking. It's almost like they have "guy on the prowl" radar. They know when we're looking...and they avoid us.
Trust me on this: Better no relationship than a bad relationship. I wish I had taken that advice on more than one ocassion.
