While pregnant with twins, I ran into my husband's mistress during a prenatal appointment at a private clinic in Kingsward. Her face went white when she saw me. Mine barely changed.   In 10 years of marriage, Alessandro Vitale had affairs with four different women. Leah Marino was neither the first nor likely to be the last. If I got angry every time it happened, I probably wouldn't live long enough to see the Vitale family appoint its next Godfather.   Yet when I returned to Vitale Estate, Alessandro was the one who confronted me. "I told you Leah and her child would never threaten you. Why did you go to the clinic and scare her?"   I lowered my gaze and put a protective hand over my stomach without arguing. He smashed a 17th-century handblown glass vase, then left for Leah's apartment with a gun and his bodyguards.   The butler stood amid the shards and cautiously asked me what he should do. I took a picture and sent it to Alessandro's mother, Caterina Vale.   10 minutes later, 15 million dollars was transferred into my personal trust. The note contained just one sentence.   Caterina: Viola, don't let another woman ruin the peace between our two families.   In the past, I would have moved the money into my daughters' education fund and told myself I could still endure the marriage. This time, I looked at the broken glass on the floor and called a divorce lawyer.