Many have been dented and panel beat by the heartbreak they find in relationship where they had high expectation. Its weighted them down such that when they meet the one who is ready to cross the ocean for them they switch off still thinking they met other regular heart breakers. But the only thing to make the difference is someone who has got good sensitive inner eyes to know the real from fake lovers. Not everyone has this eyes!
That's why yoruba adage says "If we close our eyes for bad people to pass, good people may pass us by without us noticing" I'ts the heartbreak some have experience that is making them not 2 want to believe in genuein relationship.