That does sound like the MLC confusion, and I think that not saying anything to anybody yet kind of keeps his options open. He has mentioned it to you but hasn't told anybody else is not surprising.
That sounds a lot like my situation. My H has never officially used the D word but months ago did allude to it a couple of times. As far as I know, he hasn't really told anyone what is going on - my in laws don't even have a clue.
It is like they are keeping their options open - in their minds they may think D is the answer and their way out, but they aren't really sure that is what they want. Just my opinion - can't really read their minds.:) This is where the confusion is good.
I agree with OP to keep your cards close to your vest.