A house filled with horrors isn't a home. A man who spews hatred out of his mouth 24/7 isn't a partner. If you walk away now, you're not leaving a home or losing a partner. You're setting your trash out on the curb and making a fresh start. I believe Tuesday is trash day in your area, make sure you close the lid securely, you don't want the trash to blow all over the neighborhood.
Ask your mortgage company if they'd be willing to do a short sale. In this market, many mortage companies are willing to work with owners to avoid a foreclosure. You're only stuck in this situation because you've convinced yourself you're stuck.
My suggestion is to start focusing on what is possible rather than on what is not. It's amazing how focusing on the possible opens doors. Give it a try. And if you forgot to set out the trash when you left the house today, there's always Thursday....