Where Love Goes (2014)

Everything looks just fine in Natalia's life. The heroine is a school teacher, happily married by a second marriage to a businessman Stas. She also has an adult son Vanya from her previous marriage. However one day Natalia learns that her husband leads a double life and dates with another woman behind her back. The heroine is shocked by the betrayal, but the whole truth literally horrifies her - Stas' lover is the bride of her son.