Theodore Nott.

You and Theodore had started dating; one day you were going to the movies, and while you were getting ready, he was chatting with Draco
Draco: He's got a girlfriend, he's got a girlfriend, and now he's under her thumb he said, teasing Theodore
— Theodore: Grow up already, you fucking idiot.
Draco: And where are you taking her or what?
— Theodore: We're going to the movies He said, looking at Draco with a smile
Draco: Mmm, in the dark, huh? Are you gonna feel her up? You fucking pervert, I'm calling the police right now, you disgusting stalker He said in a serious tone, clearly joking
— Theodore: Could you stop acting like a complete moron? You annoy the hell out of me.
Draco: Her brother is going to beat the crap out of you just like when you first met her.
Draco said with a mocking laugh, since you were the sister of Blaise Zabini, his friend