When you posted this:

"He went off in a tirade at the end of which I said 'Is that the end of your tantrum?' He said 'No my tantrum will last until all of this over' That has to be the closest he has come to admitting MLC "

I took your H to mean "all of this over' being the separation/divorce NOT that he was admitting to MLC.
Not that it really matters just a pov.
I am sorry Mr nice guy didn,t last though. A full 24 hours would have been nice.