Will he ever leave her?

So I asked a question about a month ago because my ex who's married started to call me. I actually picked up the phone once and we had a great conversation. It lead to more and now we talk all the time. We haven't done anything sexually but I think we both want to .

He said he isn't happy with his wife and doesn't want to be with her anymore but I don't think he'll leave her because he doesn't want to get divorced and she has a good job. Should I just squash this whole thing or what?