Love Addiction.

The First Cut Is The Deepest. Amber, an attractive young woman, who has a big career in the legal world, is in love with her husband, Malcolm. One night at a party for her husband's boss, she meets Norma, a woman who needs Amber's help with a divorce she is going through. As Amber helps Norma, she has a fling with her. Amber considers this a one night stand, but Norma wants more. Norma begins to try and break up Amber's marriage. This causes a lot of problems for Amber at home. But the end result is a cliffhanger...literally.