Ok, so there are lots of things you can do that are non-magickal to get rid of this feeling. Such as going out and finding somebody else to catch your eye :P. Having a good time. Keeping your mind off that person. Occupying your time so that the person you fancy is not in your life as much. Distance yourself from this person. You also might wanna try actually hooking up with the person to release some tension :P I know it is an odd thing to suggest but it may work (but I do not condone sexual activity, it is merely a suggestion)
On a side note, if the attraction is physical and/or mental, then it is going to be a very hard task to get rid of such feelings for this person.
Magick is not designed to fix our problems, if anything, you should use it as a last result. Anything you can deal with without calling upon higher forces, you should puruse that option instead.