My point was there really shouldn't be a difference between what you'd do if you give up versus if you stood by your M. So I'd recommend that you do 'give up' on your M. But I also recommend continuing to DB, detach, 180, GAL, and trying to be your best self.
As for feelings, I know you're worn out however I don't recommend steering through these waters using feelings. If you get to change whether you stand by your M or not when you're feeling worn out- how were you upset with her for doing the same thing? My motto is to act with the character you wish she'd had.
Finally- I understand the email was important for you for closure, so you knew you could look back and know you said your piece...but this has been emotionally draining, and it's really hard to detach while spending hours drafting communications to your WAW. And it is easy to take focus off your shortcomings and 180s. Now that that's been done it might be good to shift gears back. Dim. Detached. Personal growth in your other interpersonal relationships. GAL. Etc.
Me:38 XW:38 T:11 years M:8 years Kids: S14, D11, D7 BD/Move out day: 6/17/14, D final Dec 15