Most Helpful Guy
letting go doesn't happen immediately. you have to take it in stride and reinforce the idea that you want to let go.
make a pros and cons list and try to be as honest and realistic about as possible. you'll quickly put a visual value on the relationship itself. of you're finding you have a lot of pros to the guy, maybe its worth hanging on or maybe you're being too ideal. if there are a lot of cons, then you're opening up the doors to begin letting go by actualizing the negatives about hanging on to this guy.
if you want to let go, you also have to disassociate. stop checking on him, stop looking him up, stop contacting him. it'll take some time but eventually you'll find less and less reasons to remind yourself of him.
its also good to try and be with friends during this time. hang out with other guy friends if you have any. or talk about guys with your girl friends. the whole point is to try to distract yourself from the problem and low yourself to move on naturally.
again, none of this works immediately. it takes time. sometimes a lot of time to let go of these things.
but being able to let go will make you a stronger person in the end.