I stopped talking to this girl
What made you stop talking to her?
I just didn't like her, we were just dating for sex.
You don't have to continue a relationship if you don't want to, but you should speak to them about what you want instead of ignoring them. It will be a better way to end the relationship without too many hurt feelings.
It's too late for that, she wont care.
I do think she'll care. You ought to talk to her instead of just ghosting.