AIO Should I leave my BF? Was what he did to me forgiveable?

This is my first relationship, like I don't know for real if I'm blowing this out of porportion because yes my face and neck hurts but it was all so fast, he seemed so regretful after. I spent all day outside of the apartment. I'm not sure if I should go back or what? I'm like not even from here, we met online and dated long distance for 3 years before I visited him and moved in. He knows I don't have any other friends and my dad and I barely speak due to other issues. I am afraid, I'm worried I'm overreacting and this was just a one time blip… We are both 24