All of us have, to some degree, a personality disorder of some kind... not necessarily significant enough to be admitted to a Mental Institution, but a "Mild Personality Disorder" just the same. This means, we will never be able to fully understand each other. All we can do is to continue loving each other, with this understanding that we all have a "mild" personality disorder that prevents us from being the person that our loved ones expect of us... and we... of our loved ones.
It is through unpleasantness that we really understand the meaning of what it means to love. For if everything was nice & smooth... loving would be too easy... and we are not really tested on what it really means to love.