Husband involved with another woman

I am a forty year old women. Married for 21 years. My husband is involved with a women. I had caught him several times doing heinous activities. I have always tried to conceal and believe his fake clearances. I offer five times salah. I learn and teach Quran. I had always been far from any heinous acts. Now that he has lost his interest in me. I have read in Qur'an somewhere that good man for good women and sinful man for sinful women. Does this mean that I am also sinful? Or do some other sin so that I am paired with this man? I have four daughters. My husband shouts aloud in the house so that no one dares to discuss his evil activities. I don't know what shall I do. Every next day of my life seems more miserable. Please help me out and pray for me. If there is any wazifa in this regard, please let me know.