How to Get a Divorce?

I try to be compassionate and understanding, but my wife doesn't seem to care. All she cares about is for dieting and social events. I enjoy our social standing as well, but she takes it a bit too far. Once she flew out to new york city to go on a shopping spree without telling me she was gone. A whole day before calling the police, before she got in touch and let me know she had left. She didn't even apologize and acted like i over reacted. Currently, we are separated, but still living together. But at the end of the day, i'm just having the hardest time coming to grips with where i really believe the marriage will end