It may come to a point when the crush that you have on someone is bound to hurt probably because the person does not reciprocate your feelings. If it is just a crush though, you have nothing to worry about because you are going to get over the feeling quickly especially when you get attracted to someone else again.
There are times when the crush will hurt because you will realize that your crush is someone that you never thought he/she would be. Getting over a crush can be a bit complicated but it is bound to happen sooner or later. Just try to become rational about the whole situation so you can move on fast.