find some cuban bar, get drunk, smoke a cigar and talk to the barkeeper once a week. its less expensive than therapie and you get shitfaced on top. worked for me, and i actually met my later to be girlfriend in that bar : )
whatever, just get out, blow your mind away with new things, pic up some new sport or whatever, challenge your mind and body so you dont have enough time thinking about this.
in the end, old love only dies if new love eveolves