A bad relationship should be terminated as soon as possible. This type of relationship is not healthy or productive, yet many will hold on rather than face the prospect of being alone until they find the right romantic partner. If the individual is abusive, either physically, mentally, or emotionally, then you should get out before things get worse. If both partners do not respect each other true love can not develop, and each person can not achieve optimal growth and success.
Apologies don't mean anything if you keep doing what you're sorry for.
The last man fucked up, I'll take it since he doesn't want it.