Could be.
Why don't they just sell the fucking car and get a cheap little bachelor pad. At least there is heat, water, a washroom, kitchen, etc.
Good ol fucking TBombz.

Since it is probably her car, she needs transportation to and from her job. And getting a place means another bill that chances are she would have to front for...and groceries.
He said that she has no peoples in the area (isolation, "so now you are stuck with me"---see what I am getting at).
To me, and I could be wrong, it's bringing someone else down to hell will you...somehow having a willing (possibly by coercion due to feelings from the prior relationship) participant.
As I said, I could be wrong, but this is what I am seeing.