Selling drugs with friend=failure

Back in October-December me and my friend were selling and basically I was the person that had a job which was good and I would buy drugs with my paychecks not all of my paycheck because i could buy things for my friend and I. Except everytime i bought drugs with my friend he would sell the drugs and spend it on stupid stuff instead of saving it. My friend told me he did spend the money and I said dude you are suppose to save the money and not spend it. So when we can we can reup and i was going to add another $100 to Re-up or buy more drugs. I was frustrated because customers would ask for weed mostly and my friend spent the money that we bought on drugs. I had no problem buying beers or whatever. But my issue was him using the money that was he was spending the money that was for supplying. Lets say I spent $100 on weed i trusted someone selling and i wanted to see the $100 at the end of the night. If i did i was going to add more. Which i did for about two weeks until i realized he was spending it on gas station things.