How to though? Mine is emotionally and mentally manipulative.
Therapy
i’ve never been in an abusive relationship before, thankfully (but that’s partially due to my fear of getting into a relationship), but i’ve witnessed my mom in that position when she was married to my father and my bsf when she was with that abusive fucker aka her ex bf. i don’t remember much from it, but i do know that a good support system helps — whether that be friends, family, school staff you trust, even any community you may be in like a religious group (eg. church). just someone you can fall back on and trust them to support you in making that decision and making sure you’ll be okay. worst comes to worst, get the police involved so you can safely break up or even get a restraining order if you can (my bsf did with her ex bf, who was a psycho stalker and was actively trying to ruin her life in many ways).
another thing is a good motivator from what i’ve seen, whether that be your own safety (like with what happened to my bsf), overall your own quality of life and mental state, or the safety/concern for others — my mom feared more abt what would happen to me and my siblings rather than just herself, so that was a huge factor that played into her finally leaving him.
i suggest going on reddit on abusive relationship forums (i trust there’s got to be at least one) or even just the advice forum and seeing what other people have to say. i’ve gone to reddit before for personal issues and honestly, it’s helped a lot.
therapy is another good option tho for a support system but also getting advice on what to do and how to handle your own mental state and issues that may arise during or after the break up, if you can afford it.
i wanna take a moment to say that i’m so so proud of all the commenters who got out of their abusive relationships. that shit can be scary as fuck and sometimes even feel impossible to do, they’re all so incredibly strong for that.