'the rest of them'?
OP why didn't you say how many 'the rest of them' are?
Is it two?
It's sounds to me like it's at least three.
You keep saying 'he was unsure' about more children in the future and 'we agreed' I'd have a coil for five years and then discuss it some more then.
It sounds to me as though he was sure, but you just had your fingers in your ears.
It's not just about the vasectomy, it's the trust. He's broken your trust. I would never be able to look at him in the same way. For me, we would be done.
This is being said over and over, but I'm not sure I agree. Of course the trust has been broken and that's not good, but for this OP I actually think it is all abou the vasectomy and the trust thing is secondary.
'I'd have asked him to wait. I would not have TOLD him to wait.'
And what would you have done if he'd refused to wait? He'd still be on the sofa either way, wouldn't he?