She hid many things about Garett from Tom, not showing him the photos till Tom discovered by chance at the restaurant they were in when they flew to Mexico (again a favourite hangout for Garret and Anne). Was she truly falling in love with Tom (the look alike) or a re-live version of Garett again? She was so mesmerised by this experience that she did not (at least voluntarily) share this good news with her own daughter and her neighbour (played by Robin Williams who also fell for her).
What truly touches me was the role played by Tom. He loves Anne unconditionally, even after he discovered the real reason why Anne wanted to be with him. I am not sure any man can accept surprise like this but he did and even at his painting gallery drew a portrait of Anne in the pool while he was watching from the window. Several times during their argument, she called Tom as Garett and he was big hearted , thinking she is still in her mourning stage and accepted her wholeheartedly.
Watch this movie, it's really heart-warming and may help in changing your perspective about love and relationship!