The schoolgirl:

It is so simple: competition. I explain on my fingers. If I, as a man, just want to fuck and I offer this to a girl, then I need to browse before this, flowers, cocktails, restaurants, smart conversations, choose the right one depending on the situation. Because the girl, if she wants to fuck, will smile temptingly and will have a huge choice.
I want to marry you, sorry, I don’t have to. Thirty years ago, it was proposed and hinted to be exactly ten times. And if a girl wants to get married, let her break up herself. Because I am choosing here.

She goes to bed with whoever she wants. Your flowers-restaurants-sweets do not play a role here. If you don’t like her at first, then at least break yourself up, and if you like her, it’s enough not to behave like a fool. Regarding marriage in general amused: there are such girls in a row - "choose me, bird of happiness tomorrow", and you walk so cool and appreciate yourself, lol. Go to the lessons, you will learn about relationships when you grow up.