Unforgettable (2017)

Tessa Connover is barely coping with the end of her marriage when her ex-husband, David, becomes happily engaged to Julia Banks- not only bringing Julia into the home they once shared but also into the life of their daughter, Lilly. Trying to settle into her new role as a wife and a stepmother, Julia believes she has finally met the man of her dreams, the man who can help her put her own troubled past behind her. But Tessa's jealousy soon takes a pathological turn until she will stop at nothing to turn Julia's dream into her ultimate nightmare.