Thanks for the input. I had come to the realization in the last few days that although I have tried to "let go" of W, I have actually made little progress toward that goal. I bought a book yesterday, "How To Fall Out of Love" or something along those lines. It is a behavioral modification approach, including a chapter on thought stopping, etc.
When W came home last night, she was cold and distant. I asked if she had seen OM. She said that she saw him once, and that they went for a walk. I then asked if she had been to his new apartment, and she said she had stopped in for 5 minutes. I got angry, and she acted like she did me a favor by telling me she saw him. While I agree that it is good that she was somewhat honest, she failed to see any harm in visiting him, and claimed that she isn't "seeing him". It is time for a withdrawal, and a rebuilding of my self.