Happiness is when there is someone around you who needs you and he needs you equally. Everything else does not matter.
YYY: And you will want to eat anyway.
Zzz: And it is especially unpleasant to be in a situation where the need for a person coincides with the need to “smell.” In an uninhabited island. There is nothing to eat the second week, and there is a person next to it. Quite fed up. You have a mutual need. So to yourself "happiness"