Who is wrong?

So man and woman are in a relationship man decides to abuse drugs and ultimately devastates the family stability in all areas. Man goes on a drug binges right after woman has had enough and says no more us... woman goes and sleeps with ex 🤦🏽‍♀️ man then returns a week later begging for his family back no definite answer is given due to the fragile state of man 🤷🏽‍♀️ who is wrong here did she really cheat and does he really deserve his family back?