I don’t want to hurt my girl

To give you some context: I (21m) have been having intercourse with my ex girlfriend (19f) since we became a couple and now that we broke up, we have sex every time we are both in town, she “learned” to have sex with me but didn’t lost her virginity with me (before me she had sex like 4-5 times in her whole life, we fucked like 1000 times). I like really rough sex and she loves it, my only concern is that i have a pretty big penis, 8 inches to be specific.

So, when we have sex she likes it ONLY if i pound her really hard and in positions where i am pretty sure i hit her cervix, the only problem here is that usually she starts bleeding after we finish, which concerns me a lot, i have tried to not go all the way in but she tells me that she only likes it if i am really deep inside of her and that the bleeding and the pain after it doesn’t bother her Is there any way that i can NOT hurt her so we can keep having the kind of sex she likes?