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.
When a toxic person can no longer control you, they will try to control how others see you. The misinformation will feel unfair, but stay above it, trusting that other people will eventually see the truth just like you did.