That feeling is normal sister.
You want to be chosen for it would be calming your system to know that, despite the pain, he didn’t just abuse you sexually and emotionally since the beginning. Betrayal repaints all your history as a lie.
You believed with all yourself in the relationship, questioning if you were fooled from the start is as painful as the adultery itself. Is a multi layered trauma like most sexual and emotional abuses are. That’s why there is a high risk to develop ptsd and it taints the rest of your life as well as your past.
Thing is, the AP was picked, not chosen. He didn’t chose her over you. In a normal single dating the AP is usually a person who would lose the game every single time.
Their flaws are loud, that how a WS and AP "see each other", they probe for their same flow in others, and when they spot them they know they found another pig ready to roll in the mud. Is a mirror.
It can be anyone, it truly doesn’t matter how attractive they are or their value as a person. The WS doesn’t choose, they choose to betray themselves first, everything good they have, to soothe deep rooted insecurities.
Love is another thing, you may fall out of love for a person and in love with another, but you don’t cheat. When you fall out of love you say it and leave. That’s respect. For your ex partner. For yourself. For the future partner.
None of these exist in cheating.
Is not love just because there is sex, is validation chasing of a deeply fucked up person. Soothing their flaws through escapism and abuse of their closest one, rather than facing their issues and overcome them, because they fear they can’t. It’s the "easy" way out, because you pay the price of it all, not them.
You can’t understand it because you aren’t a cheater. So here the pick me dance comes into your mind. You think is a matter of love, sex, attraction.
Is not, is a matter of sewage and running away from themselves. The sewage is both disgusting and attractive as the way out to hide, and the mind makes up stories because it knows it all for what is really is, so that the sewer foul smell doesn’t get to you, if you can lie to yourself enough to convince you it smells like lilac.
It’s natural and it’s counterproductive exactly because you are dealing with a person capable of self deception to that extent. They deeply know the truth, and seeing your weakness and vulnerability is a hook to reinforce the story.
You want to be picked, that means your value is lower and their choice is a "betterment " they deserve better ( and a lot more bull following this point. Thing is, that is why it never works).
You accepting their abuse and corruption makes you step back. The stepping back is a mirror 🪞 that cancels the bullshit of the self deception and immediately their brain realizes that is not lilacs, but fouls sewage what they are smelling, as they always knew.
That’s why you hear to "save" your marriage you must be ready to lose it.
I like to see it even more pragmatically: your relationship is gone. From the moment your partner felt the need to cheat, it was destroyed.
You can’t save what is destroyed, is too late, you didn’t even know it was being burned to ash, you only had the intuitive feeling announcing you the disaster, but you were kept intentionally in the dark.
There’s but one thing you can do, if you decide not to leave. Rebuild.
And nobody can ever rebuild with a cheater. You can only rebuild with the person who healed from that and become a better version of themselves.