Any info would help!!

I'm currently sharing a bedroom with my boyfriend in a five bedroom house, we split his rent between the two of us. Four other people live in the house as well. Since we share a room, and basically everything (cooking food, lights on in the bedroom etc.., occasional tv watching) should I have to pay separate for hydro and gas, or should we just share the cost of one portion of the divided bill ?

thank you kindly!