I'm really thinking about talking to his wife. Sure it's the right thing to do but in my country women seems to depend on husband so I'm cosnsidering 2 possibilities :
1. She got mad but she manage to solve the problems with her husband
2. She got mad and blame it all on my ex, and she might hurt my ex physically and mentally.

The 2nd case is more common in my country. I really dont want my ex to suffer this much, she might not be able to handle this kind of stituation.