So face your "worst fear" when you can say to yourself if that's the truth, if that's what happened, then what? What will that mean to you about yourself and about her?
I can say if she is and if it's like me she doesn't mean it outright malicious. I certainly didn't and it's only now that I've grown and can use empathy (because I think when we're hurting we have to attend to ourselves so much there's nothing left over to be empathetic) but now I can see how selfish my actions were, he could have called me on it and never did...because it may have given him comfort or hope or anything.
Someone wise on this board told me one thing's for sure your marriage is dead. And as long as he's with her, he's not going to be with you.
I don't know it struck me, put me in my place, and made me stop all the but's and feeling rejected. There was no rejection...it's over, he's with someone. Now what?
You can move on with out dating someone new. You can move on in your heart, in your head, in your actions, in your outlook.