I know I have to find the strength but how does one stay strong knowing that the possibility of her coming back from this is very low Gary
Thats just it isn't it?
Let me ask you this, do you think your strength comes from her???, or is it in fact something inside you that you feel you have lost?
I am guessing you once felt strong, before you met your W ... and guess what ... THAT'S what attracted her to you in the first place ... not the 'weak' person you feel you are right now, the one who is a shell of a man you once were.
Thats where the DB process focuses on YOU and not her, you GAL, you detach, you 180 .... basically you rebuild the you that was lost.
Time to get to work, just like the gym, start with the small weights and build up .... let her and what she is doing go for now, its taking what energy you do have left, you need that for yourself in order to become who you were meant to be.