certainly don't blame you for engaging in sexting with that other woman. You felt your M was over. Along came a woman that appreciated you for who you were and showed you acceptance. This is what u needed internally and you showed momentary weakness. I think that's normal and you should not beat yourself over it. My wife told me to go out and bang other women
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This sexing was with the same woman you have been in and out of sexual R's over all these years. She is engaged and you are married. I know the above quote was not made by you, but for whoever should read this post I want to say something to you. If the above statement can be justified, then every EA out there can use the same justification!
It would not have been right with "any" woman, but this is a woman you have a sexual history with. Have you ever told your W about her, or did you keep that part of your life a secret?
What if your W decides to do a little snooping herself?
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!