I am so sorry that you are going through all of this. You can't make him tell you who he was talking with but I am sure now you will be watching everything that is going on.
I think at this point you really need to look out for yourself and your daughter. Do what you think is best for the two of you. Unfortunately men don't always put their families first when they are dealing with a personal crisis.
I wish there was more I could say. I will keep you in my prayers. You know that we are all here for you whenever you need us.