Who do I get over the feeling of wanting to hurt someone, who hurt me?

Hurting someone else is never the answer. If they hurt you and you are defending yourself, maybe then. If someone hurt you and you're not defending yourself, it's best to tell someone that can do something about the person that hurt you.

I would like to first of all say it is good you want to make peace with the thought, feeling of wanting to cause someone harm because they hurt you. Depending on how poorly some treated you in the past (cheating, abusing, neglecting, blaming, not inviting you to a party etc) you may want to reflect what exact emotions were you feeling when you were let down. It is also important to acknowledge your values and whether your behaviors or actions go against those values. A serious question to ask yourself is what feelings do you get when you are watching and reading violent content which is graphic etc and is this in any way encouraging the curiosity about what it would feel like to inflict harm? You may want to reflect on whether someone has told you or shown non-verbally that you have hurt them. Would you encourage them to take revenge on you, make amends or end the relationship in a straightforward, sensitive way? If you are struggling with thoughts regarding causing harm to others you may want to refer to sites such as International OCD foundation. A listener would suggest you refer to 7cups.com/crisis to get support for the struggle to cope with thoughts of wanting to hurt others. Reading this article could be helpful providing some examples on what maybe happening potentially and if you can relate (https://iocdf.org/expert-opinions/expert-opinion-violent-obsessions/). Discussing your concerns with a doctor maybe helpful - it maybe a scary step but could be useful in giving a name to what your going through and the management to your urges.