Hey. We are all in this together in one way or another. Ill try to help when I can but I don't know everything either.
Good move communicating about kids. Don't hold any of that. He is their father regardless. If you hold back. You give him something to hold against you but more importantly your kids have something to hold against you. Be the better person here and set a good example. If he holds out on you....you still need to not hold info from him.
Sadness is normal when going through this type of stuff. Its OK to feel that way. Just don't get bogged down by it. Anytime I could feel it starting to consume me I went and did something to cheer me up. Even if it was just a little it helped
Read the other posts around here and you will find that your not the only one and there is a lot of positive help.