You shouldn't tell him how disappointed you are for the exact reason that you shouldn't let him continue conversations that are negative. It gives him that much more to live down before he comes back to you... granted that is IF he comes back. Nonetheless, there is no reason to make it difficult unless you wouldn't have him back.
Also, it isn't healthy to say every angry thought that comes into your mind. That's the very thing your H is guilty of when he says things that he'll feel differently about later. It's very easy to have feelings of the moment (both as the WA and LBS), it doesn't help anyone to let it all out in the name of some self-righteous honesty. It may hurt a little to swallow it now, but you'll be able to look back and say you never took a cheap shot. Let's face it, he is an easy target right now, isn't he? --z