Why were you the one to move out if it were she who wanted the split?
She needs to see some consequences as you should not be subsidizing her fun and games. I don't care how "boring" you think you are, she has broken up a perfectly fine family just to indulge a fantasy.
God, I hate these "family-of-origin" issues. We all have them, but most of us grow the f up and get past it.
Anyway, Puppy, Gucci, Coach, and a few others here give excellent "tough love" advice. Try searching them out, and my prayers go out to you and everyone else who wants to preserve their marriages.