it comes from a story. The girl was blind and her boyfriend took good care of her. Later, someone donated the cornea, and the girl regained her sight, only to find that her boyfriend was blind. Later, I can't remember, maybe the girl broke up because of it, and the boy died in an accident. The last words left to the girl before she died were: Take care of my eyes. The girl's eyes were originally donated by the boy. I guess it's from this story, but I don't know what this signature of your ex-boyfriend means. I think it's probably to let you remember his kindness to you and continue to live a good life. It's just a wild guess.