Replying to Is this morally right?

I need other opinions. So me and 3 friends have a apartment off campus. We had a few beers last night and were talking about how bills are due at the end of the week. The way our bills are set up one friend has cable and electric in his name and another has heat in his name. So the one with the heat finally tells us today that pretty much what happens every month is this. He takes what ever the bill is from each of us (usually around 15 bucks each) and offers it to his mom to pay the bill. She says don't worry about it i will take care of it. So he then turns around and uses the money we gave him to pay my other roommate for cable and electric. I found this very fucked up and called him out and almost got in my first fight will a roommate. my 2 other roommates agree with me and I need a general consensus before i refuse to pay for heat for the rest of the year.