Sometimes you go out with someone you have a crush on and then quickly realize there is nothing there. You might have wanted to go out because you have something in common, but then you realize that one thing is the only thing you have in common. And to be clear, this is just a hypothetical, and not a real thing that happened to me over the weekend.
You might be sitting at the bar discussing your common interest for let's say, I don't know, fourteen minutes. Then after that you realize that you have nothing else in common. That's the end of things. It's a real bummer. I'm assuming. Obviously, I don't know for sure.
That is just one of the countless ways a crush can end. At least, that's what I've been told.