If I was Rocky I would've probably killed Paulie a hundred times over...
He was just such a leeching ungrateful bastard. It's almost a challenge to count the number of times Paulie did something only a true douche bag could accomplish. I don't know why Rocky put up with it. I guess you need to have an entourage if you're the champ, but why would you include a hateful snake in your crew. The last straw was obviously when he eventually invested all of Rocky's money in a piss-poor company and bankrupted the family, but he should've been gone long before then.
Thanks to K. Coyle for the link!