"I didn't want to cause any more problems." Kitty caught that look; that was the look of someone who wanted to punch Calvin in the face. Granted, Kurt handled things calmly about 99% of the time, but she knew it was a lot harder to keep it together when it came to Calvin. Kitty knew that probably better than anybody.
"You're upset," she frowned, "and I didn't want that either. Calvin seemed upset, too, I'm pretty sure whatever friendship we had is gone now, and if you could maybe not say anything to him about this, that would be great." Nothing good could come out of a confrontation between the two of them, and just thinking about it made Kitty want to die. Maybe she should have consulted Wicked about this first.