Good afternoon,
All good advice and sorry to hear of it. Without trying to bash the gay community, it's utterly his fault by at least knowing he was on "both sides of the tracks" when they were wed. In her shoes we'd do what she will do certainly, but as the other posters mentioned, she does need to be given a serious medical check-up. What in sweet Jesus he was thinking, is anyone's guess. But it almost sounds as though he was either ashamed and or she is just that great of a gal for him to try a new life style, or he's got some major issues and needs mental help.
Being her third marriage isn't implicating that she has issues herself, just that perhaps she hasn't found that "One and only." If she were my sister, I's just say "Don't give up" Now days there is always a better chance that asking those hard questions in the beginning is wise, although might seem presumptuous and give "Mr. Right" pause. Just the risk we take at times. Not knowing her age nor likes and such, it's never easy to advise another in that way. But I have been blessed with my Mr. for nearly 50 years now with no regrets, though there were times we had our own issues. Kids. money, family, health and the ever frustrating Cold shoulder moments, you know the usual potholes in the roads of life among those occasional indifference's. Aside of what some might think without knowing anything of her, she like all the rest of us deserve a man/ or he a woman that understands what all that means, and can overlook those little things that make us all so different. At least that's how it should be once she finds that ONE TRUE LOVE.
Our daughter met "Him" He had a great job with Federal Service. He didn't smoke or drink. He would now and then stop by a casino or buy a lottery ticket, so nothing to speak of as a gambler. He was easy on the eyes, seemed to adore her and never disagreed about things. But after a couple years of "seeing each other" she found out that he was doing quite alot of seeing others as well. He was the fellow that seemed to own nothing within a relationship but her devotion. That brings to mind that old phrase..."When it seem too good to be true, it usually is." She was devastated but got over it and him. She didn't give up and now her second try at life's most treasured feeling, LOVE...has turned out GREAT for the last twenty years and as a result of those successes of both our son and daughter, we have three grandchildren. Derek, our son has been down that road twice and he too finally found Miss Right. Just help her get through it and try to help keep her spirits as high as you can. With hope and some time, when she least expects it, "He'll" come along. We cannot expect to go through life totally unaware that there are those like her husband, but seldom expect it to land at our door front. She does need to go forward and perhaps be more selective?
I sure hope it all works out best for her. God Bless.