When you think you're strong enough to get back into the difficult relationship

When you reach your breaking point with someone, you might make the decision to leave. During that time, you can regain your confidence and feel your power again. You might even decide to give the relationship a second chance, knowing that if you see any warning signs, you can address them right away.  That is until you are once again coerced into staying in a situation that seems destined to go down the exact same path as before. Now what?