He said to her, “Get in the car, I will divorce you”

I am a short-tempered young man, and I do not know what I am saying when I get very angry, to such an extent that I feel as if I am not myself when I get angry. My wife was with me in the car and we argued, and she got out of the car and said to me, “Divorce me,” but she did not mean what she said, because she was upset. I said to her, “Get in the car, I will divorce you”, although I did not have the slightest intention of divorcing her. What is the ruling on this?.