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I am still struggling with the idea of what might occur if W's EA turns into PA.


You shouldn't be making a distinction between EA/PA. If he has her heart, there is nothing she won't do for him.

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sick to my stomach about what is happening.


This is normal. Get some exercise.

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Do you know if you will be able to forgive your wife at any point?


Already have. You must let it go; it's for you, not her.

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Will you take her back?


That depends on a lot of factors, of course. I won't settle for being her second choice. I deserve better. Plenty of beautiful women will put me first; I won't settle for less.

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I feel A LOT of guilt for my behavior and driving her to do this in many ways.


Focus your efforts here. This is something you control.