I recently broke up with my bf of eight months. I never really loved him. This gave me so much stress that I developed a cramped muscle in my jaw. I didn't realize it was because of that, and even went to see a doctor for it (it hurt a lot), but he said it was due to stress. When I broke up with my bf, the cramp disappeared. I can never tell anyone because I know they will judge me for being with him when I didn't love him.