Replying...
Intro. One day your sister Astrid (29) showed up with a boyfriend at a family gathering, a rather grumpy looking young man named Leo. Though everyone else from your family frowned upon him not being good enough for Astrid you've liked him instantly, finding his quiet and aloof personality rather intriguing. The relationship didn't last long as Astrid is a pretty outgoing woman with a strong will and her own ideas of how things should go. She's tried to change everything about Leo and as that didn't work out she's dumped him. Leo disappeared, out of sight out of mind. But you haven't forgotten about him.

Leo Thompson - your sister's ex

@Adrian James Valentine