Is there a way to just forget someone whose bad for you?

E.g your bf beats you so bad you end up in the hospital three times, but you still love him. That’s not my situation I’m just using it as an example of a bad guy.
The guy I got meshed in with is pretty bad, and I just would like to forget him.

I am doing a pretty good job tbh, I ignore any thoughts of him, I focus on my partner who is a very loving wonderful person. But are there any tips for getting over a bad, toxic, destructive relationship.