We are happy in friendship because we don’t expect in friendship. Whatever we get is bonus.
In personal relations, our expectations are sky high because we have outlined every personal relations with many expectations.
Besides, we are saddened because, everyone have limitations and cant come through with all the expectations set.
Eventually we get into a blame, jittery mode towards relations. Its good to keep relations also on friendship mode with a little more casualness. The relations would look beautiful.