How is having your own revenge affair an example of the "healthiest way possible"?
You had a chance to save your marriage and didn't because you were involved with someone else - so, it seems, "plan Card" might have worked for you but was it really "the best chance your relationship/marriage had"??? Was it really DB at all (I don't see dating other women on Sandy's list)????
I truly pray your girlfriend isn't a rinse and repeat of your soon to be ex-wife - she already has a pretty big knock against her being willing to date a married man and all. I wish you well. Infidelity is certainly a huge trauma - I just hope the extra consequences of your choices to apparently commit adultery (maybe you aren't having sex with your girlfriend, I don't know) don't hurt you and your daughter that much more down the road.
The internet is 90% complaining and entitlement and I hate it because I deserve better!