...CERTAINLY not "happy" or anything that would imply "I'm OK with all of this."
Strong, leading, upbeat with your 180s and GALs, but NOT condoning their behavior. You want to take a stance, where -- if they ASK you (and don't offer this proactively, or it will come across as pursuing), you can say "Oh, don't get me wrong, this is NOT what I wanted, and NOT what I would have chosen. But I realize that I'll be OK either way. I very much WANT to be married to you, but I realize now that I don't NEED to be, and I certainly respect myself too much to be willing to put up with your crap behavior just to stay married. I'm in a positive mood I guess because I'm working hard to improve myself, whether it turns out to be for THIS relationship, or for another one down the road."
"What is best for my kids is best for me"
Persevere = happily being patient over a long period of time