The Half Day

On a half day at my middle school I went out to lunch with a couple of friends, and we didn't invite one of our other good friends. She told us to have a good time at lunch, but it was sarcasm. She was mad that she was not invited and we did not talk for a while after that. But the next day my friends and she were talking, but she wasn't talking to me. I got mad and said something about her that was not true. I feel bad, and I know I shouldn't have said that about my friend.