Of course, then you have a societal problem in that you’re tying people’s ability to keep a roof over their head to their ability to correctly find a partner they can be with for multiple decades.

There are a slew of people out there who can keep a healthy relationship with someone much easier than keep a job. I'd venture to say that most people find benefit in finding a life partner. Hence why they keep doing it (even multiple times).

Of course, once someone finds someone else I suppose one should ceremoniously back down and stay home in order to conform to other norms.

You aren't though. The majority of people do, so the median household (by definition in the majority group) fits that group of people.

There's plenty of 1 or 2 bedrooms for those who don't find a life partner, end their relationship, etc.