I think it's not fair to the uniqueness and wonderfulness of the individuals, that we can complement one another greatly, but we are not the source of each other's happiness, especially if you don't know who the hell you're talking to.
There seems to be something in the human soul that causes us to think less of ourselves every time we do something wrong. . . And maybe it is good for us to feel that way. It may make us more sensitive to what we do wrong and move us to repent and grow.