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.
Ok, I misunderstood your post! I am deeply sorry. I thought you wanted to forget about the feelings. Disregard my post above.
There are many non-magickal ways to go about this. Try talking to him, letting the other person know how you feel. Try "making a move" on this person. Find out if the feelings you have are mutually shared.
Types of spells you can do are glamours (spells that are cast in order to bring out attractive qualities or desired qualities that are already within you), Spells designed to encourage feelings in the other person that are already there, Spells to call love to you (to find love). I suggest you search around for a good spell - even though I do not condone the use of the spells on the site - and test it out.
If you have any other questions about spell casting, etc. Feel free to ask.