Admit, haven't seen the movie yet, but just read this plot synopsis of Unforgettable, 2017:

"Tessa Connover is barely coping with the end of her marriage when her ex-husband, David, becomes happily engaged to Julia. 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. Tessa's jealousy takes a pathological turn, and she will stop at nothing to turn Julia's dream into the ultimate nightmare."

Not sure how it will play out? But, from the trailers I've seen, all you see are the two women. No ex-/DH is in sight (Kind of like real life .)