Typically women don't just have emotional affairs. It almost always moves to a physical affair pretty quickly. You need to accept that as pretty much a fact.
You also need to accept the fact that you will be getting divorced. Now, how would you live your life at that point? I'm not talking about dating. That's what the GAL is about.
You've probably tied your identity to her as a couple. And when you are begging, pleading, and crying for her you end up looking kind of pathetic. Sorry to be blunt, but it's true. I've been there. You need to be a strong, confident person.