Why does Dr.Jekyll want to be Hyde?

Dr. Jekyll is a researcher who deals mostly with chemicals. Dr. Jekyll has always been curious about the dual nature of man, especially his own dual nature. In an attempt to take the darkness from his own soul, he used chemicals to create an elixir that would separate the two sides of his nature. This causes Dr. Jekyll to separate into Mr. Hyde each time he drinks the elixir, but he is stuck with both sides of his nature when the elixir wears off.

After learning of Mr. Hyde's evil nature, Dr. Jekyll decides to end the experiment. However, Dr. Jekyll has had several episodes where he turns into Mr. Hyde without the elixir. Dr. Jekyll has also discovered that one of the key ingredients of his elixir was tainted. This unknown substance was what caused the transformation. Without the mystery ingredient, Dr. Jekyll cannot recreate his elixir or control Mr. Hyde’s appearance. For this reason, Dr. Jekyll kills himself when he realizes his time has run out in finding a way to control Mr. Hyde.