This post is about and for you:
No matter what your background is, I think you describe thoughts and feelings that every BS deals with.
You are stronger than you realize.
You can get through the fear, grief, anger, and shame that comes with being betrayed. A good IC can help you use this experience (being betrayed) as a catapult from low self-esteem to high self-esteem. That's the more accurate way to see yourself - loving, lovable, capable. It's not easy, but you can make that change.
One sign of you being loving, lovable, and capable is the way you've responded to your W's A. The A is traumatic. It's excruciatingly painful. It's a shock. No one goes through this without great disorientation.
It's healthy to want to R, and it's healthy to want to rid yourself or your betrayer. Have faith in yourself to get your heart, head, and gut into alignment on one decision or another. You're moving to that already.
If you like Bigger's speech, use it. He wrote it so anyone can use it. The1stWife has a similar approach, perhaps more succinct.
I'm all for R when both partners will do the necessary work. Your W is still in her A, and I think she's a lousy candidate for R. That may change when she gets served, and that may be a cause for reconsidering your actions - but let's not waste energy on that until it happens.
You're doing great. You don't realize it because of all the pain that's been dumped on you by your W and throughout your background - but even with all that, you're doing great.
*****
No matter what your W says, she chose to cheat because of her own issues, not because of issues with you or your M. She may have focused her own shit on her image of you, but her dissatisfaction is with herself, and that's her problem to solve. She's the only one who can solve it, just as you're the only one who can choose to love yourself and dump the incorrect low self-image.
Please, do not blame yourself for your W's failings.
*****
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...and if you do it wrong, so be it.