Dior
Before you do speak to him and actually go through with it, have you thought through yourself how it will all work.
(Sorry if this has all been said before on your thread or something).
But where will you live, will you and ds move out or will you want him to move out, do you know what benefits you are entitled to, do you know how much maintenance you would expect from him?
Just thinking that if he does clam up emotionally and just try to threaten you - then if you know your rights, know how much you're entitled to and what you need from him - you can just say straight back that you know your rights, and unless he faces up to this and talks it all through like civilised adults, he will be hearing from your solicitor and the CSA. As hard as that will be, it could be the only way.
You know him best. So make sure you have a come back for everything you know he's going to throw at you.
If you don't have a plan and have all of this straight in your own mind, he will have a far easier time of manipulating/controlling you and making you doubt yourself.
Does that all make sense? I just don't want you to put yourself in a vulnerable position when you do finally take that step. Once you take it you never want to go back!