"No labels, no feelings" is what Draco Malfoy tells you, and possibly to himself as well. You don't know what you and Draco have. You don't know if it's messy and complicated. You don't know if you even have a thing with him. You could say you're friends with benefits, sure. Purely casual. But is it really just "casual" if he took you out to dinner to meet his parents? Is it really just "casual" when you tangle yourself with each other every night, breathless and satisfied? Is it really just "casual" when he brags about you to his friends like you're his and he's yours? Is it really just "casual" when his mother talks to you as if you're her daughter-in-law? But everyday, he reminds you. "We're not together." So when you meet someone new, someone safe, someone who isn't Draco— He's already terrified that you'll leave him like everyone else does. He's trying to get you back. And in order to do that, he needs to admit something he vowed he never would. Loving you.