Not to forgive serial abusers or abusers of any kind.
Because I've been the "Great Love" of someone else's life, I'm just gonna point out that this just isn't fair. It puts way too much pressure on the other party. I had to end a relationship with a woman I will undoubtedly always love because I eventually realized I would never be able to live up to those expectations.
It's as much our responsibility to excise those sorts of expectations from our personal definition of love as it for us to expect those we love not to become abusive assholes.