Continuing from my comment on Abandoned (read the comment to understand this meaning)...
In his mind's eye, Ariel looks back on his journey. He reflects on leaving Helena and her resulting death, and his abandonment of Marguerite. He has forsaken the two women who loved him. He realizes that he is the cause of this sorrow and pain, and that he will never be free from the consequences of his actions.
Continuing from my comment on Abandoned (read the comment to understand this meaning)... In his mind's eye, Ariel looks back on his journey. He reflects on leaving Helena and her resulting death, and his abandonment of Marguerite. He has forsaken the two women who loved him. He realizes that he is the cause of this sorrow and pain, and that he will never be free from the consequences of his actions.