Blaise nodded at Draco's words. "I'm afraid my intention was never to offend. However, I do agree that you behaved deplorably, but I also think that has something to do with our redheaded friend. She's made you soft, Malfoy. To be honest, I find it mildly amusing. For future reference, I will not stand to be accused of attempting to steal anyone's beau when that is obviously not the case. I know boundaries better than most people, and I'd like you to remember that."
Blaise paused, pursing his lips together in thought. How best to approach this subject? "Fortunately, besides being one of my oldest friends, Draco, you were also not the main source of offense in this case. You're absolved, but I would suggest you make your... girlfriend aware that she was out of line. Especially as she is so keen to fit in with Society, she should be made aware of the etiquette of an apology."