I fail to understand what's so great about this woman in the first place. She was having an emotional affair with you. Have you ever heard that saying, "If they'll cheat with you, they'll cheat on you."?

Move on. Keep it civil at work. But move the fuck on. Find someone to date who doesn't think it's ok to have an inappropriate relationship with a workmate while they have a partner sitting at home.

ETA: Dating coworkers in almost never a good idea.