Not A Bank

I've been recently bombarded with requests for money against a monthly payment that I make to a certain individual. Mind you, I'm never behind on my payments, and this person keeps hitting me up for draws on that payment. Then when they run out or I have given them the payment in full, minus the draws, they get drunk and forget. I'm not a bank and they are taking this too far. If I'm paying for the next month's payment after this month's has already been paid, then I am over extending my finances' for this month. Yet, every time they get into a tight, here they come wanting to borrow, money on the payment that's coming up, in order to make it. I'm about to give up and get away from this payment and these people.