You shouldn't tell someone they'll never find love.
Mario watches another woman use  his friend, Fred, until Fred is broke financially and emotionally.
Mario wants Fred to stop being used by women.
Mario tells Fred there is someone for everyone and counsels Fred to be more careful who he hands his heart to.
Mario tells Fred all women will ever do is use him and tells Fred he should use them back.
Fred takes  Mario's advice to heart  and eventually meets a woman he marries.
Fred falls in to a deep depression and  never dates again.