I agree you gotta blame yourself for getting ripped by the middle man. He/She either kept half your money and went back later ,or most likely kept half the dope and screwed you that way. You gotta learn the difference between a 1/2 gram and a gram somehow by eyeball which is not so easy. Is it tar or powder you got? I imagine tar is harder to tell how much is there, but powder is easier IMO to tell between 1/2 gram and a gram depending on if it's just powder or powder and some "rocks" of powder. Anyway you gotta keep the middle man at your house and weigh it out in front of that dude and make him take you into the dope dealer's house, do not go there yourself even though you know where it's at!!! That equals a bullet someplaces and trouble at best, you need to meet the dealer and shit through your middle man and tell him that you will hook him up for free for introducing you to the dealer,and you should not let him know he's your only connection, but it is not doubt too late for that.. The middle man is not going there for you out of kindness after all, hes doing it to pinch your dope and get a free 1/2 gram it sounds like. If you know a non user that can hook you up they are less likely to screw you over , you just toss them a few extra sollars for their trouble, but always meet the middlemans hookup as soon as you can!!!