I don't have a history of happy relationships and my parents had a terrible relationship, so perhaps I am biased.
But reading threads on MN seems to confirm that the majority of relationships aren't characterised by love, trust, passion, or intimacy. Instead, many of us settle for less than this - due to financial reasons, children, or fear of loneliness.
I'm not saying that the majority of relationships are abusive but that many are unfulfilling.