Bella,
I hope in 9 years , where you are, the money from him is not needed and not worth any contact with him be it 1 dollar or a million dollars. Definitely battle now for majority custody now and thus more child support as he doesn't sound like someone who really cares about the kids.. Make sure you specify explicitly in the settlement what he is still responsible for ..ie their education expenses, medical etc.
Maybe he thinks you dont deserve "a lifetime of money" but your kids do.. If I didnt put in my agreement what my GX needs to provide for her own kids I feel she would simply give any money ..hers, mine, the kids to her girlfriend. You cannot tell me however good of a father/parent they are that they are thinking about anything but their new gay life.. their is just no way they are thinking about Johnny's college fund. Even if you or your lawyer cant protect yourself as much as you hope protect the kids with a fierceness that confounds and shocks.