It means you all are too young and immature to be having sex yet.
So a guy I’ve been seeing told me a while ago that I was amazingin bed and said I was the best but now I asked him am I still good and his words were just “yeah don’t worry about a thing” what does that mean?
It means you were too easy.
It means He's a player and you got played!!!
The initial sexual attraction is waning for him. If sex was the only reason that you two are together, that's never enough; and he is on his way to another girl.
try not to let that worry you.