Damon didn't care if Stefan told Elena that or not. It would serve the purpose of masking his true feelings, even if he didn't understand those himself. But he was not one to be honest, when pretending served his purpose better.
Realizing that his glass was empty, he poured another as well as one for his brother. He walked the glass over and held it out to Stefan with a condescending smirk. "Maybe I don't wish to share my company with either of them tonight, hmmm? What about you? Has Elena put herself off limits tonight? Is that why you're playing the silent brooding hero again? Waiting for her permission to run to her side and play gallant once more? You should try that cape over the mud puddle trick. It worked wonders for Sir Walter Raleigh."
The more sarcastic Damon got, the more his eyes glistened. One of his favorite pastimes was baiting his brother. It was a habit acquired over years of practice.