I feel like I'll be telling him something that is really really wrong with him.
I don't know what you plan to say during this talk.
There's a huge difference if 'the talk' is intended to change him vs 'the talk' being about how _you_ feel and what things _you_ intend to change for yourself and your kids.
I've learned that if I avoid or I tiptoe around an issue....then I'm not giving myself or the other person the dignity of choice. These days I try to speak the truth with love and respect myself and others.
I don't want to live a life hiding my feelings and deferring my own needs and thoughts for the sake of keeping the peace. I grew up in that atmosphere. On the other hand there are plenty of times when I find it best to just accept things as they are and leave it alone-
but in those cases I still find some way to adapt or change things on my end of it. Actions speak louder than words.