Wow, that's really heavy! I've been married for a long time now, can't even imagine what that could be like. Maybe she just wants the thrill of the chase and at some point, she'll come back to earth and find out what an *** she's been. It must be hard to accept what she's doing, but four and a half years is a lot of time invested to be throwing away. Any chance you two can get some help together? I hope the best works out for you.