You don't need to absorb how he interprets what you say. Be authentic. Use "D felt that... and I felt that... " phrases, which own how you feel without attacking him. If you think that leaving D7 out of the conversation altogether would be better, than you can suck it up and say, "I felt hurt by your disregard when you asked if D7 wanted to change plans. I had plans, and that affected me, and I'd appreciate it if you talked to me privately before you sprung that on me. And I promise that I'll try not to do the same to you, okay?"
Let him know that you are on to him. After all, if YOU had done this, he'd have chapped your ass... right?
"There are only 2 ways to live your life. One is as though nothing is a miracle. The other is as though everything is a miracle."
