Honestly, I don't see the problem here. I think she is on some kind of ego trip. Throwing temptation at her? Not from my viewpoint. I wouldn't give her a second look if I saw her on the street. I think someone used flattery to convince her she was far hotter than she really is and succeeded in bedding her. She let it go to her head and started giving off that "I'm easy" vibe and just decided she'd rather screw around than be a faithful person. Guess that whole commitment and integrity thing is lost on her.
GMTA. That song popped into my head as well.
Every time I think of the song, though, I always remember an incident from 30-odd years ago. I went over to visit my sister one day, and two of her friends were there, a couple who had just gotten married a day or so before. I shook the man’s hand, saying with great sincerity, “Congratulations! I’m sure you’ll be very happy for the rest of your life.” He was pleased at the congratulations, and my sister nearly died laughing, then couldn’t explain what was so funny.
My take comes from my experience.....I had a lovely wife who was enticed away from me, after 23 years together.