What is significant about Jane's decision to return to Mr. Rochester, especially considering his physical state?

The importance is that Jane wanted to care and provide for Mr. Rochester financially as compared to the time when he was the time who used to care for her. This gave her the morale to remain loyal to herself because she still loved him.

Jane felt that is was her responsibility to sacrifice her dignity and character because of the man that he loved most. She felt her love for him as significant, and she was ready to do anything for him even though she would not change her character for him.