There are reasons he's right about what he did and there are reasons I'm right about being upset about it but it definitely cost us our friendship.
I think back that if he had operated with integrity and honored his agreement to keep me on for two extra months it would have not been upsetting to leave then. As it was it left me scrambling with three small kids.
The lesson to me is that even if the startup is flush with cash, there will be issues. How the founder manages those issues matters.
I recall when I had my startup I did a bunch of business coaching and really had to take on a lot of uncomfortable things about myself. I'm grateful for that. I invited him many times to participate in that work and he never did. When the money is good you think you don't need it.