How does one co-exist? With peers or like-minded individuals? These relationships can be examined and statements regarding be made. However, co-existing with one's own entity is another story.
Even in a stable environment, emotions will unavoidably be unstable. So, how do you pull yourself, and your goals, apart from the seemingly trivial? Those limited instances, which many claim comprise you, also may not define you, or perhaps not properly, or entirely... giving off to others, the wrong interpretation of who you are; a second, potentially fake version of you The emotional side, which only appears in limited instances, due to certain events.
So, in an all-encompassing scope, which piece of your puzzle are your emotions? Are they interchangeable, do they cause other pieces to be created, or do they stem from an original root? Your true identity deep down inside is amendable, due to this other you - the emotional side. Now tell me, how do you co-exist with yourself?