Abusive people will apologize again and again then return to their abusive behaviors. This is not enough, from a Karmic point of view. It is so easy to apologize. Many insincere people do it on a regular basis because they think they will be off the hook.
We must go a step beyond merely apologizing to effectively clean up our Karmic debt. That means being good to the person we harmed as well as to others in general. It also means never to do the “wrong things" again.