SD, you have no choice over her decisions and actions, you have choices regarding how they affect you.
You're a decent human being with values, that's why you love her and want the M. What's there to be sorry for here? Accept and take pride in that.
Working on yourself, doing what you humanly can, and giving up what you can't to God is NOT easy - You may feel you can do "more" - but really that may be all the "more" you can and should do. It's one thing to be determined, another to be stubborn and avoid reality. That is one form of what may be called the LBS fog IMO.
Me 42 W 39 Married: 11 Jan 1998, T: Since 1992 First Bomb: Sep 2007 Confirmed A/OM: 4 Nov 2007 Kids: D10, S5 Reconciled and together again after (alot of) time and heartbreak. 3rd kid, S, born 2 Jan 2010.