Originally Posted by PolyLinguist
I quite agree on the first part. Indeed, we are all lonely at times. It is not even a bad thing.
The second part I am not sure what you mean. Why is what you say a problem? Especially in the case of people doing monogamy: strictly speaking they have only one "relationship", don't they? Some people do expect constant companionship from their mono partner, but others don't.
That's why I said "the way a lot out people do monogamy" and not a problem with monogamy itself. It's unrealistic to expect anyone to solve a problem that is inherent in the human condition itself. That, in turn, puts pressure on your partners to do the impossible.
Sadly, it's not uncommon for people to expect their partners to do the impossible.