Sam2,
That is absolutely ridiculous. Someone should be happy with their spouse and know that they have different Yisronos and different Chesronos than everyone else.
You’re confusing idealism with pragmatism. Of course it would be ideal for everyone to be sameach b’chelko, but we should, on a practical, level deal with the frailties of human nature.
The yetzer horah doesn’t work with cold logic alone.