roommate rant

Ugh so mad me and my fiancé agreed to help his friend who is 19 get an apartment with us. Well we found one and moved in on December 22. He brought a girl over and we went to the store. We agreed that we don't want the smell of weed inside the apartment. When me and my fiancé went to the store across the street than came back. When I walked inside the apartment the weed smell hit me straight in the face. It was so strong and I automatically got pissed. I seriously HATE the smell of weed. His friend left before we got back so I couldn't say anything. Do I have a right too be mad? He agreed that he wouldn't smoke inside the apartment when we moved together. I know he pays rent too but I don't want too smell weed what if my family and nieces and newborn nephew came over.