I want him to leave his wife and stop staying with her

I’ve been in a relationship with a married man for a couple of months. The way he takes care of me and the things he does for me are marvelous it all shows that he loves me. The problem is he is still living with his wife in the same house but they are using different rooms. He told me that they are separated, everything is perfect so far but when I ask him about her opinion of getting divorced with her, he keeps ignoring that question. I don’t know the reason why but I want him to leave his wife and stop staying with her, how can I do that?