You have every right to respond to violence with violence, especially then your abuser is a grown fucking man who ought to be caring for you rather than causing you pain. You aren't required to forgive, and fuck anyone who says that being angry or fighting back makes you just as bad. It's also normal to still feel traumatized by events that happened one or two years ago, or even long before then, especially if you are still required to interact with him.
Yeah, it took me a long while to realize that his responses to stressors were really inappropriate and that there was a serious power imbalance between him and I when we did fight. Thank you for the message. It’s really validating and helpful!