The emotion of disappointment arises when you resist surrender.  It gradually eats away at the ego. You experience a kind of suffering until you reach a stage when you accept another way of living exists. You are only willing to surrender to who you are when you reach a point where you have had enough.  You decide to end the thoughts and interpretations that create self-inflicted suffering.  As you realize you have a choice, you can decide to stop imposing suffering on others and cease your own as well. Every let down is a teacher.  Otherwise, you would not awaken to know suffering is over.  You discern infinite reasons to be and allow love.  You intuitively release patterns, peel away the old to reveal something new.