Will her relationship last?

WOMEN: I need honest advice. My ex-girlfriend got married 4 months ago to another guy. I am too devastated to describe. We dated for 3 years, then our relationship became longdistance last year. I KNEW she wanted to get married, but I stalled. Either way, she called me about 7 months ago and told me she wanted to get married and that some guy (an exboyfriend) where she lived asked her to marry him. I thought she was just making this up, and I told her we would marry in a few months, I felt no threat that she would do something crazy, thought she was talking crazy. Well, I found out she later accepted with this guy and they got married 3 months later. Since this, she has written my mom, telling her that she thinks she made a mistake and loves me too much, married for desperation, but that she cant divorce bcs she would feel too guilty for her husband. Claims she is "happy," but my mom says she wouldnt say things if she was. This makes me VERY sick. Will this last with this guy?