I'm so sorry for your sitch. I recently found out about A too and then on Tuesday found W with OM in her new (2 day old) apartment. What I learned here is no to make any life changing decisions (like moving away). Just go dark and let some time pass before deciding on what to do.
Again I'm sorry and I really feel your pain.
M 35 W 28 D 4
Bomb 4/28/08 Found out about PA 05/14/08 Separated 5/25/08 (not legally)