Why did his gf post a puzzle piece?

I wished my ex best friend happy birthday. And then i posted on my story "looking for my missing puzzle piece to my heart" then his gf posted a picture of her and my ex bestfriend...with a caption of the puzzle piece.. what is she trying to say?

This page is a permanent link to the reply below and its nested replies. See all post replies »

Similarname · 46-50, M

She is saying that she has taken your missing puzzle piece, and those 2 are now a couple(?)