A woman typically blows problems way out of proportions because her response is emotional. The problem is rarely as big as the emotional response. As a man, you have to be the mountain - unmovable, unshakeable, unreactive to the gale force winds, and appropriately help to reduce the apparent size of the problem back down.
By asking if you're still together, you're giving her emotional response to the problem more credit than you should. She "stalked," and you made up. If you frame it as you're still together and like nothing really happened, then you probably can slide right past the fight. If you ask if you're still together, you're not only acknowledging that the problem was that big, but giving her way too much value in your life.