Hi. Be selfish I have read several books about the selfish gene. Friend that is in our genes.
We also learned to be from the context. Our parents lived for us without knowing how they gave us and pleased their wishes.
I can only tell you that agreements must exist within a community. It is not a question of helping each other when the other needs it, that is companionship. What I tell you is to make a contract where everyone agrees on when to do things and when not. I lose my freedom when I interrupt my neighbor's.

Friend, reach agreements and fulfill them.