Someone who's possessive and clingy would drive me crazy. They would have to understand my eccentricities and not try to convert me into someone they see as more normal. When single people shop for groceries, they are often forced into buying more than they want. For example, if I want to buy ground beef I have to buy a whole pound at once. The people who pack the ground beef must assume that the whole family will be consuming it and not just one person.
Bread is an even worse problem.
There's no way to just buy a few slices at a time. Of course this would be no problem if I was married with kids. I've partly solved this problem by freezing some of the bread for later use but then having to thaw it out is quite inconvienient. I think you get the point.