first of all : , i want you to know that we care about you, and are glad you came to us (noticing you "only" got 6 posts until now)

of course there is no way to quickly shut love down... that's just how love is
i also had problem getting over my love (not saying that i'm completely through with it), i've tried analyzing what happened to me after i was sure she wouldn't love me back and now hope that what applies to me also applies to you
since i was able to (almost) completely avoid her i had the opportunity to reflect about what happened, something you unfortunatly cannot easily accomplish because you often see him.
i cannot say that my 'findings' are 100% accurate, but i hope they work for you.

since you cannot avoid him completely... following my advise will not be easy for you, because in my opinion, the key is: distraction
what i mean by that is that you have to find joy in other parts of your life, when you are always thinking about him there is absolutley NO WAY you can stop loving him
but these 'distractions' must not mean that you shut yourself out from others, isolating yourself is the worst that could happen to you.
you must do stuff you enjoy, and you must do it with other people, to actually feel joy in living again. i just can't emphazise more how important friends are when dealing with those situations... even when you are not really talking to them about your problems. can you actually do that? can you go out and have fun with people?
you can't turn love on, nor you can turn it off... therefore you need to distract yourself from it.
thinking about him will alway hurt... that's part of the experience, because you remember what happened between you. and the problem when you remember it is you wish those times back, because they were better or could have been better (wishful-thinking) than the present. that big gap between the "might-be" and the present is was causes pain, so you must improve your present in order not to wish back those times that much anymore...
when you don't wish back those times, then you don't feel pain.
love is a very beautiful part in life... there is no feeling that could match it, but still, it isn't necessary for being happy. there are other things that give you joy... "lower" joy, but still joy... and when you have managed to get on with your life somehow, to actually find it worth living and you quit thinking about him all the time, then you can be open for another love. there is no way to force it, it will happen sometime, but only if you are ready for it.
there will always be some hurt left... imagine when a shark attacks you, you'll always be afraid of water... even when you learned to swim again there is always this brief memory of what happened...

again i want to tell you that that's my interpretation of MY OWN experience... but i hope that what i "learned" from my experience can be applied to generally losing someone you love
i would like you to update us what happens to you, meaning that you tell us what your problems are following my advise (i actually failed at the "feeling joy somewhere else" part because i had to abandon my friend when i avoided her...)
and of course you can always pm me if you need help, or post it in the forum (and pm me that you posted it because i don't want to miss it )
at last i want to point out that there are always ups and downs, and you musn't crash down completely when you realise that you are not as progressed as you thought you would, it really takes much time, especially when you see him regulary... i wish you the very best i can
many hugs to you