I definitely know how you feel. I am resisting all I can right now not to snoop through her email, which I figured out I can access. Yes, I know it's also legally wrong!! There is one woman who a PA occured with 7 years ago that I still find myself keeping tabs on through public data sites. I still fight the urge to drive by recent OW home, track license plates etc. I even called her ex to get her new number - just so I have information and what I think is power. I know it's all wrong. It's not healthy. I have been doing really good lately and it has been because I chose to focus on myself. I am feeling SO much better about who I am and what I have to offer. This makes those OW look like jokes to me. Sadly, they are pretty pathetic. the living with mom, bad 80's hair 40 year-olds pretending to be 20 year-olds... but I digress.
My advice... Don't be idle. I find that I am more drawn to this destructive behavior when I don't have enough to do. Stay busy. Find something creative and constructive and GAL for you to do. And ALWAYS remember that OW is not in your marriage. She never will be. My H always got/gets really mad if he find out I have been snooping or talking to/worrying about OW. And that doesn't ever help things.
Good luck. It's hard but the bad taste in your mouth will go away.
Lilypad
Me 31 H 33 (8 EA/PA in 12 years) S 6 D due in September! Together 14 yrs Married 3 years Bomb - threatened this week (repeatedly)