Isn’t romanticism a literary movement from 18th century Europe? 👀
Numbers aside, having a compatible partner to share your life with is generally nice - doubt anyone really disagrees with that.
It’s the lock-in clause of “life partner” that really complicates things.
Obviously, people want some kind of emotional security.
But forcefully staying together after falling out of love also sucks.
Everyone grows and changes over the course of their lives, and you can’t expect to be with the effectively same person forever.
IMHO, the very existence of divorce and break-ups invalidates the idea of having an absolute “life partner” anyway.
Marriage also only makes sense if you want to have kids.
Some social/legal pressure to stay together for the sake of the kids can be helpful.
Otherwise, cut out the complications.
Clearly communicate your needs and expectations. And treat your partner(s) with respect before, during and (if it comes to that) after a relationship.
Easier said than done, I know, but better in the long run.