Well... you know how you get upset because you have to live in a world like this? First you have your good side and then you have your bad side. Your
good side is so pleasant and nice, and then Hyde comes along and destroys all those nice feelings.
If you ever stood in front of a mirror, where there was another mirror further behind you, and you caught a glimpse in the mirror of your other self,
in the other mirror, it would appear as though there was a stranger in the room with you. It is not though. It is only you reflected in another angle.
Sort of like looking at someone else out of your eyes, and they appear like a stranger. Then they are the same way too, looking at you, thinking of
you as the stranger.
This is what it is similar to having the two sides. The so called good and evil.