Aah, yes...the MLC lingo at its best. He's angry because you aren't bending to his way of thinking. He's angry because you are standing your ground. He's acting like a spoiled 2 yr old brat who isn't getting his way. He's going to stomp his feet and threaten everything from here to the moon and back...but you know what? You need to let him stew in own juices in that stew pot.
Please do not respond to his text of ranting and raving. If you do, you are feeding into his attention getting behavior. It doesn't matter whether it's positive or negative energy, but you need to remain silent and just let him be. You aren't going to be able to reason w/him and I do think that if you respond and say that you are sorry he feels that way, it will fuel is anger that much more at this time.
It's best to let this one simmer for a while. He will contact you again, but from here on out...everything needs to go through your lawyer. I know exactly what you are going through and I, too, got those nasty texts/emails from my xh when he realized that I wasn't going to allow him to walk all over me during the divorce. My lawyer's advice was golden...he advised me to not respond and that was the best advice I was given. What he's doing is trying to bully you into submission and if that doesn't work, he'll come at you w/being nice or try something different. Please do not open yourself up to any more grief from this man. Until he grows up and realizes what he's lost, he's going to be a Peter Pan, searching for something that only he has within him.
Please do not respond to his rants. You do not owe him anything at this time. This is a business deal that has gone sour and he's a very angry man because he's not getting what he thinks he deserves.
Please, please take care of yourself and listen to your lawyer.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.