To think that this is just one more reason not to trust a word he says?

[SoonToBePinocchiosExWife]

So I'm a week away from stbxh moving out. I've sorted out a car so I can continue working, childcare to cover my working hours and have been looking forward to a fresh start. Stbxh has been a nightmare throughout, telling me one moment that our separation is temporary, and in the next breath telling me I'm a disappointment to him and a complete failure. He's extremely angry and feels justified in treating me like shit because, and I quote, he "doesn't like the way I speak to him". He's also upset that I don't trust him 🤦
Given that there have been multiple incidents of dishonesty from him, it's hardly surprising that I might not be making an effort to speak gently to him really.
Anyway, he's been putting off us speaking to our 5 year old DS about the separation for weeks and I finally told him that we needed to do it soon given that he's leaving in a week. Turns out that he told him 2 weeks ago, which explains why the poor boy has been so teary at school. I'm absolutely livid and cannot see how an otherwise intelligent man can not realise that I might not be happy about this. Am I being unreasonable to expect that he should have told me that he'd dropped this bombshell on our DS?
I'm just so angry that I can't see the wood for the trees.

Your poor boy. I’m surprised he didn’t mention it to you though over these two weeks

What a fucker. Well rid.

Not only did he not mention it, he actually told me that we should do it together nearer the time! F**kwit.

Spot on.

That's a deliberate disregard for DS' needs. Prick.

Utterly selfish twatty move. Definitely well rid of him OP.

It amazes me that he thinks this is ok. He claims to love him, but he doesn't seem to have considered him at all. I know I'm going to have to pick up the pieces and watching him being a Disney dad is making me just want to bash him with a frying pan. He's made more effort in the last couple of months than in the whole of his life and it's just going to destroy my son when he goes. Caught between elation that this nightmare marriage is over and extreme sadness for the pain that my son is going to have to endure.

He's a 'his way or no way' man who seemingly goes out of his way to push your buttons. Nasty doesn't cover it.
It'll be 1000 times easier once he's gone and your son will thrive in a non-hostile environment so try not to worry too much. Find an energetic sport that allows you to let off steam (thinking kick boxing or similar...), find a counsellor who can help you to vent, and look forward to a life without the wanker.