Honestly, I don't think you can ever just stop loving someone you had so much love for.
You say he left a huge gap...does that mean you're not 100% sure why things ended? Or they ended on bad terms? It sounds like you could be aching for closure. A lot of people after a relationship have all the "Why?" questions. "Why did we break up?" "Why did he stop loving me?" "Why didn't I try harder?" etc. Yes, of course you would miss him, but I think what's really hurting you is this "gap" he left you with. You probably feel like you need something to fill it.
I agree with the posters above that time heals all, it sounds cliche but it's true. And as far as cutting off all contact, I agree. At least until you know you're completely over it. Maybe put away anything that reminds you of him, gifts, jewelry, old t-shirts you maybe have kept etc. Continue to stay active in your social life, and maybe have one or two girlfriends you can call on when you're having these feelings. We tend to dwell on things the most when we're alone and there's nothing to distract us, so as long as you try to surround yourself with positive people or keep yourself busy with things you love, but that don't remind you of him, so that your mind can't drift back to that sadness.
Good luck and I'll keep you in my thoughts. I've never lost a love, but I've lost friends and relatives to very tragic circumstances, and I've felt that endless pain. It's like you wanna rub a spot in your heart that you can't quite reach, but trust me, after a little time, that will go away.