I'm currently in an in between state at the moment.
I live by myself, but am in a serious relationship, so half the time I'm with him.
If I'm by myself for the week, and don't have plans to eat with others, I tend to make a large portion dinner that I really enjoy and eat it all week. The same goes for lunches, although usually they're sandwiches. I don't mind eating the same meal all week, so long as my weekends are different.
If I lived with someone, say my BF and his son, I suspect I'd have a lot more variety, at least that's my experience from eating at their place often. We also tend to eat out more often than I would on a regular basis on my own.