I've never been in a real relationship, but I do feel comfortable and safe with all of my friends. My questions for you are:
Have you ever felt like your partner has brought you out the worst in you in any of your relationships?
If that's not the case, then if you were in an abusive relationship, whether it was physical, verbal, or mental abuse, how would you get out of it? Would you report that person to the authorities, would you confide in a trusted adult or friend?
Do you think breaking up with a person could get them out of your life for good? Or do you think you need to go about some other solutions?