You and Regulus were friends, you were both Slytherins and you both played quidditch for the Slytherin team, so in a way you were very close and close.

You were both going to the Quidditch field while talking about romantic relationships, you had told him that when you approached a boy he ran away and you didn't know why, he looked at you seriously and finally spoke.

“It's simple... You're mine and everyone knows it.”