I don't think you are stingy. As the saying goes, it is easier for young couples to get along when they are still in love. The little things in life can kill people the most. I also share a room with my classmates now. We agreed to eat separately before we started sharing. We used to have a good relationship, but I'm afraid we'll look like enemies because of these little things. Your boyfriend may feel embarrassed. Look, talk to them when you get a chance. Anyway, everyone should understand.