From what I've seen over the years, there are many people who are living with someone, but still living alone. It happens with a lot of couples. They have very little to say to each other, they have their own activities and interests and their lives don't intersect much, even though they occupy the same house and sometimes, the same bed.
"It happens with a lot of couples." I agree. I know of a local couple, in their 90s with health issues (the husb can hardly walk and was recently blinded in one eye) who live in a great big old house on 5 acres. The wife has been begging the husband for a while to move (I don't know if to something just slightly smaller or into a small senior apartment), he's been refusing, so she finally moved into a seniors apartment (it's either independent or assisted living). They're not getting divorced (not yet anyway), he's going to stay with her a couple of days a week at the seniors place but will live the rest of the time at their big old house because he refuses to leave his "beloved home."
She said she just couldn't take it anymore, that she was exhausted trying to take care of him and everything else around that big old place. If more people could afford to do that, I bet they would. The least expensive of whichever place she's in goes for around $3,500/month around here.
What I'm afraid will happen is, he's going to get in an auto accident (I *think* he's still driving) and it's going to be his fault or enough important people involved will think it's his fault, because, c'mon, he's in his 90s, blind in one eye, can hardly walk so how quick is he on the brake pedal?
So then they get sued and even if they win the lawsuit, they have to sell that big house and acreage to pay the legal bills. So it will no longer be the nice seniors place with the dining room and the shuttle bus for those who can no longer drive where she's living now; it'll be a low-rent little apartment in maybe a not-so-nice section of town. Or maybe even worse in some ways: both of them stuffed into a single bedroom in their daughters place. All because of his stubbornness.