Jacky Cheung's "When Love Becomes a Habit", please tell me the meaning of this song.

Love is a habit, because if you love for a long time, you will feel it is a habit. In fact, you can experience it from life. Habits are formed over time. Over time, habit is an unconscious way of doing things. If love becomes unconscious, doesn't the taste of love change? In this way, sadness is inevitable! ! But when we are apart, when we recall these "habits", we will feel sad, because it is not easy to form a habit, and it is also difficult to abandon a habit! ! This is the essence of human emotion.