Half the men in Seattle are never-married singles, census data shows

Anecdotally, among the people I know in Seattle, many people who have happily been in the same relationship for decades are not married. People are not avoiding long-term relationships, they are avoiding the baggage and fairly rigid assumptions that comes with state intervention in their relationships. There is zero social pressure to be “officially” married so people have no reason to do it for the sake of social conformity. Both men and women are subscribing to this.

I think some of this is a side-effect of many people planning to never have children.

One thing to be mindful of is that this limits your ability to help your partner as you age. State intervention can play both ways.