It's a deep question, that would not be solved on Duolingo. But still, happiness is a feeling or an impression that sometimes does not correspond exactly to reality. Is this for this reason less valuable than the one that is more deeply rooted in reality and certainly more stable? I guess so: but everything can be reevaluated afterwards and sincerity can be used as a tool to take off the stains of unreality from this fictional happiness that breaks hearts and causes depression. It requires courage and love (everything portrayed in this statement is not fictitious. The identification with actual persons and places is actually intended and should be inferred).