Should I leave him??

Me and my bf were having sex for the first time. (I’m not a virgin ive just always been with guys who were “small” downstairs. Also I have a tilted cervix making sex kinda uncomfortable anyways. It hurt SO bad almost to the point I was crying. I told him to stop and he just kept going saying this is the only way your going to get stretched out. And afterwards he told me “I’m not going to keep babying you like this every time we have sex”