No way to answer your questions, really, WCL...
one way you'll certainly sabotage yourself is in only stating wants instead of defining actions...
what's your plan?
When you act self-destructively, you harm others. Are you going to change those choices, too?
Act from love today, from respect...do not own all of the issues...that's as much fantasy as blame-shifting them to her...
you are only and completely half of every relationship you have on this earth...no more and not a whit less. Get to understand which you act from...your choice to love or fear...learn to listen, separate what is yours from what isn't...and understand how the past is unchangeable, the future is unknowable...except for the boundaries you make and keep...
in the present.
You may well have lost your marriage...you knew it was a boundary enforcement if you crossed that marital boundary again...and you did.
Don't suppose what it looks like to others...that's more fantasy. You want reality the most right now...to see where you distort to justify, resent and entitle...which makes sure you're right and a failure, simultaneously.
You are neither. You're you. Understand the difference between your choices and yourself, 'k? You are loved.
Your choices are not.
They hurt as well as heal. Choose well. You can do this. Do not go quietly into that good marital night...keep making those great choices...
and make one more...is the EA partner married? Be honest and inform her BF or BH about the A, 'k? That's if you didn't before.
Write out your amends...where you acknowledge to your wife and self what you did and didn't do that harmed our marriage, harmed her...what your thinking was and why you won't do it again...
maybe it will take not going to bars without her...
maybe it will take not going to work events without her...
maybe it will take you knowing your weakness (in counseling) and putting in place the extraordinary precautions necessary, not caring what other people think, only what you know of yourself, and the love of yourself being worthy enough to protect what you value most...
the marriage...
even when you don't feel like valuing/honoring yourself or your partner...
you do so, anyway.
LA