ASK AMY: Personal trainer needs some personal training

Dear Amy: I am a personal trainer in my early 20s. I have been hooking up with a woman (almost 40) for the past few months, two or three times a week. Her husband found out about us. Yesterday, he called the gym where I work and also called my mother and told her I was sleeping with his wife. My mom is furious. Then he came after me at the gym.