Just some quick thoughts:

1. What we focus on does expand. Meaning, if you are focused on your past, it is bound to repeat itself.

2. You are only responsible for you. Meaning, it's not your wife who has to change. It is YOU.

3. You are giving your W too much power and are sounding like you are the victim.

None of this will resolve itself overnight or quickly, no matter what YOU decide YOU want (try and save the M or go for a D). No relationship is going to fix/address the causes that brought you to this situation, only you can fix/address those things...

Good luck. Keep posting.