Charmin School

Yesterday, my roommate picked up some household supplies (toilet paper, sponges, etc.) and asked me to split the cost. I've bought plenty of household supplies in the two years we've lived together without ever asking for any money. It feels weird and cheap that he's suddenly doing this. Am I being unreasonable in feeling this way, or is he being seriously petty?

--Annoyed

Weird conflicts like this make you start seeing your roommate differently, and not in a good way -- kind of like Joan of...