Below, you'll see any text that was highlighted with comments from the reviewer.
The third and final sentences were very strong. It's obvious the narrator loved this character and that he love her back. She's still suffering from the loss and the writer makes that point clear.
You keep things very vague, preferring to throw only the bare minimum scraps of information to the reader. You leave the reader constantly questioning things. Who was this man? How was he related to the narrator? The tone is wistful.
You left out commas and apostrophes. Besides that, you have a very solid piece. You can be more descriptive by giving examples of how the narrator was "wrapped up in her own world" so that the reader gets a stronger sense of her character and simultaneously the man she's talking about. It's a very short piece, but I feel like you did it justice.