from 10 30  he is asked if he can say something about koffi from the bottom of his heart, he says he is happy and relieved that koffi is free and that koffi does not have anything to prove anymore in his career and everybody knows it but indirectly says to koffi to be careful about mixing love and work with cindy because it can cause him problems and also that koffi does not need stupid polemic anymore and also says something about people  around koffi ,he tells them to come  next to koffi only for his music and not to gossip to his ears some stuff which makes him angry because it makes him react and its somehow for such stuff that he went to prison

He is objective in his assessment of Koffi. Musically, Koffi has nothing to prove to anyone. His name will go in the books as one of Congo's most popular and successful musician. If he's not had any intimate moment with Cindy, then he has a chance at redeeming himself. There's no way he can't see that he has a problem with people who have a problem with Cindy. He just should retire and enjoy his life.

What I don't understand is why, Koffi's wife doesn't speak or does anything about Koffi's relationship with Cindy, of course she knows it, but she seems to silently accepting the fact that her husband is unfaithful

you know at some point those women kinda get used to it,except some strong characters like amida or nana who sometimes "punish" their husbands somehow

It is quite obvious that Nana has got a very strong hold on Fally and she has been able to put him under control.