The more Harry talked the sadder Draco got, but only because it was painfully clear that Harry had no idea how to accept love. He would never say that, because he didn't want to get hexed, but it made him even more determined to stick this out, no matter how deep Harry cut.
"I'm staying because I love you. That's it. No game. No ulterior motive."
He couldn't convince Harry that he meant it in one night though. He had hoped the months they'd already had together counted for something, but clearly not. Draco was stubborn though, and he worked for what he wanted. He wouldn't give up on Harry that easily.
"You don't have to believe me tonight. I'll still be here tomorrow. And the day after. And the day after that."