[norswap]

I think you can find beauty / intrinsic meaning in marriage, and that it can be done for other reasons than forced commitment.

But I'm not trying to explain why you (or anybody else in particular) committed to a single person romantically. I'm trying to explain why it's popular in general.

Imagine we could reset social norms around monogamy. Maybe you would still be monogamous for other reasons. I suspect many monogamous people, without the normative baggage, would go polygamous -- i.e. they don't consider monogamy to be intrinsically superior/good the way you do. I also suspect that over time the norm towards monogamy would creep back in for purely pragmatic reasons.