She is broken and was looking for something to fill that hole. I don't think limerence or sexual longing had anything to do with it. She needed to feel good about herself. No matter how bad he treated her, she felt like he couldn't stay away and felt she was desirable, sad.
This describes almost all cheating and cheaters to some level. It isn't just your WW that felt this way and used someone who "couldn't stay away" as validation; it's most. And the OM exploited that? Of course because that is validation from the other side of the same equation, the other type of cheater motivation. It's the yin yang. We all get our validation in one of these two ways, unless we get it the best way--just happy with ourselves in general.
You feel powerful because you can control a relationship.
Or you feel valuable because someone cares enough to control you.
You feel impprtant because someone listens whenever you talk.
Or you feel valuable because someone chooses to talk to you when they could talk to others.
You feel powerful because you can "get some."
Or you feel valuable because you have something that someone actually wants.
You feel attractive because you can talk someone into having sex with you.
Or you feel attractive because someone was willing to cheat, lie, compromise their morals TO have sex with you.
You feel complimented because someone agrees to go out with you.
Or you feel flattered that they asked.
Different situations, personalities, or times in our life bring different types of taker/giver validation, but "getting something" from someone is just one type of validation; having something that someone wants, being pursued, is the other type of validation. And cheating validation revolves around both of these forms, whether it was a serial cheater, an LTA or a one time thing. BOTH people feel validated by the risk (along with feeling disgusting and immoral, but that's pushed away to focus on the needed message of value) and acquiescing.
The whole thing is disgusting and pathetic, Achilles. But your WW was in it for the exact same ego kibbles as every other WW, no worse and no better. And the OM was in it for the exact same ego kibbles as every other OM, no worse and no better. But it was all about the external and additional validation. Those who thrive on external validation or need it to survive some inner crisis will not be validated by an already stable R or M; the validation needs to come from either new sources like serial cheaters or constant risks like LTAs. Stability does not breed ego kibbles. A stable relationship is two people mostly providing their own ego kibbles and not expecting the M to do it for them. The M is icing on the cake but not a source of continual "look at how amazing I am."
I am very sorry for what you are going through, and it is true that she needs to see the monster that she was, the pathetic and broken woman she probably still is. And she needs to own every corner of that truth for you to feel like she is starting to fill that emptiness the right way. That's what is so unsafe about the unremorseful--how can they fix what they still want to hide and forget about? Every time they won't talk, won't discuss, won't condemn something, it leaves you with an image of a big, empty hole you're both jumping over in that moment, a hole big enough to swallow you both up yet again. You feel the danger in that moment, the darkness lurking because they yet again "don't want to talk about it right now." It's like a dark cloud passes overhead because we know that a willingness to talk and talk and talk about those dark places and admit them is the first visible sign of meaningful change. I hope she gets there soon.
[This message edited by OwningItNow at 4:39 AM, November 20th (Friday)]