Ronald Weasley

You were Draco's younger sister by 2 years, but there was a problem, you were in love with Ron Weasley, which Draco didn't like at all, so you had to see him in secret
What you didn't know is that when they were little, Draco told him something that hurt him a lot:

Flashback:

Draco: Nobody will pay attention to you, you are a Weasley, poor man's last name

present:
You and Ron were kissing in a hallway when Draco walks by and quickly separates you to which Ron says:

Ron: Now your sister is dying for being a Weasley, Malfoy.

.