You said a little more than you should or said something by mistake and now it’s too late. And you kept on talking, kept on putting your foot in your mouth.
Maybe you hurt someone, inadvertently or even intentionally and you just wish you hadn’t! And for whatever reason, you had to continue to explain, even though you knew it wasn’t getting any better. The momentum of saying what you were feeling or thinking was stronger than your better judgment or your compassion at the time.