She's not going to admit it to you - and WASs can be amazing liars. Many of us have been lied to our face. Sometimes quite convincingly.
That being said - let's presume, for a tiny moment, that she ISN'T having an affair with Roy. Why, then, is she leaving the marriage without giving counseling a try? Why is she abandoning her lucrative career to move to the town that Roy happens to be living in? Why wasn't she trying to work on the marriage before? Why is she suddenly justifying it being over after her spending a weekend away where Roy lives? And what is wrong with her, that she leans on a compulsive liar who abuses women financially for support in leaving her "supposedly" broken marriage that you knew nothing about until recently?
Sorry - I've tried to imagine any other explanation besides an affair and frankly, can't think of one. I suppose she could just be looking for an alcoholic drinking buddy but she could have done that much closer to home.
Do you have access to cell phone records? Usually they leave a trail of nonstop texts and/or calls to the affair partner.
But the bottom line is - she has left the marriage. She didn't give you an opportunity to try to repair whatever she thought was wrong. You weren't head over heels in love with her when you married her. She's an alcoholic in denial. Hard as this might be to hear, she may be doing you a favor by leaving you. Let go or be dragged. I know it's hard to see them driving towards a cliff but right now there is nothing you can do to save her. She is firing you from that job.
