I truly feel sorry for you, this is embarrassing cope. She fucks unpleasant, gross men, that's her choice, she's probably as happy as a pig in shit and she has definitely gotten away with her part in your husband's gross choices.
Just like your husband has.
I was hoping you might have said "But then, after I booted him out, his dick rotted off and he lost his job".
Instead, you're miserable, living with a man you feel normal and understandable resentment towards, and you know about just one of the women he fucked, but as you know they never just fuck one. And of curse i wasn't ever just an emotional affair, he was screwing her the whole time.
And you are still absolutely fixated on her life while she has likely forgotten you exist.
You should have just kicked him out. Liars gonna lie.
But since you chose to tolerate his horrible, unforgiveable choices, you need to find a way to stop fixating on her and move on.
What a bummer on an otherwise fun thread.