My life of isolation taught me a number of techniques, one was to have rows/arguements with my 'H' when he wasn't there 
I would say all the things I wanted to say, call him all the things I wanted to call him and cry all the tears I didn't want him to see.
It helped me get the frustration out, so I wouldn't internalise it, and I wouldn't take it out on the wrong person.
Mostly it worked.
I think sarjose has good reason to have that conversation, but the Ex doesn't need to hear it with his own ears. TBH, I don't think it'e make a jot of difference if he did, all he would get out of it would be that he has got a dialogue going with sarjose, and has an 'IN'.
Personally I don't think it's worth sarjose wasting her breath in a conversation with this guy. He is not interested in anyone else except himself. So tell him off, call him all the names under the sun, say all the things you would say if you knew he would listen, but outloud with only yourself to hear the words.
If he were a good guy who freaked and flipped, it's one thing, he isn't. he abused and walked out on a lady in her final weeks of PG with his child.
he is following the same sick script all abusers follow, to the letter.
Sarjose, you have done the right thing, you really have, keep focussed and keep looking ahead of you, if you look back and get sucked in by his I've changed honest I have bollocks, it'll be harder to get out the next time.
You are worth so much more. i bet he convinced you that you were lucky to be with him didn't he? Well he was lucky to be with you, he knew it and knew also that he couldn't compete, so he set about destroying you, crushing you so that he looked better and you hung on his every word... (projecting here aren't i? 
)
If you have a stalker who calls you incessantly, and after 100 rings you finally answer, what has the stalker learned? That to get to you they have to make at least 100 calls. If you leave it to 200 calls the next time, the stalker knows they have to try harder.
if you never engage, cut all ways of communications and if you have DC leave only one method, but severely restricted, YOU dear sarjose have regained the upper hand.
One thing I am beginning to realise is that you can not apply normal logic to these abusive men, they don't think like normal people, you can't explain to them that xy or z really hurts and needs to stop and they will. They will hear xy and z is working, so will find another way of doing it or carry on regardless. You have to think like a winner, you are playing to win back your freedom.
Mouseface, the little I have heard of your story, you ought to lurk at least on that thread, get some questions answered. What have you got to be scared of?, you did nothing wrong, and IIRC your ex put you through 7 bells of hell. You are worth the investment mousey. If you want company over there all you have to do is PM me.
Sorry for the epic.... will trot off and earn some money now....
Back later..