MOVING.
Move away from the situation, if at all possible. Have a job offer in another state/province/country? Take it. Need to go to school elsewhere? Go. Want to "travel" and never come back? Buy a one-way ticket.
My wife and I moved from one Canadian province to another, and not being around all the "encouragement" really helped us expedite the leaving process. This is not to say it was easy. It wasn't. But just being in a new place helped wipe the proverbial slate clean.
It might seem a bit difficult given certain cases, but at least consider it. Your sanity and/or spiritual health may be at stake. And that's more than reason enough.