A woman here. Perhaps she genuinely thinks that you need to gain more experience as a man, since she was your first girlfriend. This is a dumb move on her side, because inexperienced male is less cynical and more devoted for a relationship material, but she herself does not have the knowledge to understand that. But in any case, from a female perspective, it is her loss in the long run and as soon as there is another woman in your life she will be jealous. You should start dating and "gain experience".