bleeding during sex!!! HELP!!

Jaiden

Few weeks ago me and this guy had sex and he is relativity big. But when we got done we realised at some point I had started to bleed. Then a week later me and another guy had sex but I didn't bleed but he was relatively the same size. then here today be and the one guy had sex again and I started to bleed again on the same guy. could it be from him being big and we went semi rough. But the other guy was around the same size and we went semi rough as well. I'm confused on why I keep bleeding with this dude.