A married woman game her telephone in a restaurant, where I

A married woman game her telephone in a restaurant, where I was alone and next to my table was she and sis husband. The husband was not polite with her, in fact he was talking by the cell mor than half an hour. When the man went to the restrooms, the lady gave me her telephone anf told me that her husband does not take care of her. She ask me to call her since she wanted to make love. My first time to have adultery and I feel guilty