@hentieluvr depending on the composition of the necklace, you could use soldering iron, heat fan, or super glue to "repair it" while expressing that you are sorry for breaking it in the first place. How to solve a problem you yourself caused in the first place.
I love this the first time they met was with him and her shoe and this time he has an item that he needs to returns to her dam the japanese love their clichéeeeesssssssss