we hit it off pretty great. first date was fun and we didn't have sex. the next 2 dates we just had a lot of sex. but now I'm not really sure I wanna date her after spending some time with and getting to know her. it seems like we're pretty different and we only had fun cuz it was new and exciting. I did not intend on having sex so soon and I definitely did not intend on using her for sex. so how do I tell her so she doesn't feel used or betrayed?