Jethro - you did not blow it. It's part of the learning process. I understand that it is very tough to "let go" of the OP but you need to let it die a natural death.
I've read a few times on the boards about the "Stop Sign" technique that people use whenever visions of OP come dancing in their heads. Don't know if you have tried that but it may be worth a shot. The OP is not worthy of your time, effort and energy. Be there for your W - listen intently and validate her feelings.
BTW Jethro - what are doing for yourself today? I went to the gym for a good workout earlier and am expecting a couple of Big Band CDs in the mail through Amazon. Grew up listening to that kind of music and it helps me to relax.