[supernoodles!]

this is just my opinion but
never cheat,no matter what you do.In my own experience if i was in this situation I would stick with bf all the way.Actually I have been in this situation before and I cheated and my bf found out and yeh he forgave me but i know it must be in the back of his mind 24/7 because ive been cheated on by someone i love and i know what it does to you.
However I dont know how you and your bf feel about each other and whos anyone to guess at how long your relationship will last,i think you should just go with the flow,stay faithful to your bf,remain friends with your crush but make clear to him whenever he flirts that your taken and try not to flirt with him at all,even if you are a natural flirt.
If it was ment to happen with the crush then it will,and in time.