Looking for a certain chapter

I hope someone can help me find a chapter I read a while ago:

The chapter is about a guy hooking up with a random girl at a concert because he's told that she's easy. Then he meets her again at a later concert and asks her for another round, but she rejects him saying that she never hooks up with the same guy twice, but he convinces her anyway, because there aren't that many other people at the concert, and she has probably slept with all the other people there anyway. This happens a couple of times until the chapter ends with them meeting randomly on the street one day; him in a suit and her in a school uniform.

Thanks in advance