Well, for me...
I'm at the point of sticking it out until the wife says that she's done for sure. I tried and tried - all by "myself" to save "us".
Now I've given it completely to God and am praying a bunch. We're going to try this: she comes over after work and "we" spend time with the kids doing homework, family time, dinner, put the kids to bed and then she goes home. If at the end of a pre-determined period of time she feels comfortable enough with being around "me" (basically meaning she wants to try) then we're going to spend a pre-determined period of time working, seriously, on us (she moves in - dates - hopefully marriage counseling - etc.
However, if she decides not to then at this point I tell her that I want it to work out - but also that I want it all. If she does not want to try at this point then it is time to move on.