Why don't I have crushes anymore?

Every year since I was in kindergarten I have had a crush. There was always that one guy who when I looked at him or he talked to me I couldn't stop smiling and heart would beat really hard and my face would get all hot. (it was a different guy every year/grade - with the exception of 4th-5th) I loved that feeling, but ever since the end of 8th grade I haven't had a guy to think about. Actually it was right after I had the biggest crush ever and we liked each other and we always talked and then we went out for a month and then everything turned upside down, and he dumped me. I was in a big depression, but after a while I sorta got over it. But now I am not attracted to any guys. I mean maybe a little but not enough that they're always on my mind or something. And I'm afraid I won't ever feel that way anymore or something.
Why don't I have crushes anymore?
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