"You just watch somebody you love slowly, slowly disappear and go away"

In this quote, Michael Reagan is expressing the heart-wrenching pain of viewing somebody you like slowly disappear and ultimately leave your life. Using the word "simply" implies that this is a common and inevitable experience, however it does not make it any less hard. The repeating of "slowly" highlights the steady nature of this loss, which can be even more painful than a sudden departure. The use of "vanish" and "go away" suggests that the individual is not physically dying, but rather altering or leaving in some other way. Overall, this quote records the emotional toll of losing somebody dear to us.