I thought this would probably happen. Know what she neatly did? Made you accept that things continue with OM. You went from saying you wouldn't have her back unless she was done, to letting her continue things with OM while she's with you. She's talking about how she doesn't trust you are different and taking attention away from the fact that SHE'S CHEATING ON YOU.
Yes, they have withdrawals, but I'll tell you what...withdrawals don't end if you keep do a little bit of what you are withdrawing from, like cigarettes...you can't quit by smoking one or two a day.
I thought she responded better to the guy that showed his strong side and wouldn't put up with that. She started talking about trying again when she felt she was losing you, and started backsliding when she had you and you were being more needy and accepting of her affair. Something to consider. If it were me, I'd tell her if she wasn't with you because she wants the marriage to work, that it would be better for her to go.
You cannot be lonely if you like the person you're alone with. Dr. Wayne Dyer