I'm not sure what you expect from the developer, to just take it? He doesn't have power in the company because even though he's a 50% shareholder, he's not on the board of directors.
I mean, personally, I hold them both to the same standard of professionalism, as they were both "c-levels" within their company. He's more than a developer, at that point, so airing of dirty laundry comes off as kind of a petty attempt at "bringing the other guy down with me". Especially the times where he was posting direct snippets from their private emails, then a sinister sounding summary of the rest (but not the actual content of the rest, meaning he's probably twisting some words).
I think both sides are acting really shitty here, I wouldn't want to partner with either of them in any future endeavor.
I think both sides are acting really shitty here, I wouldn't want to partner with either of them in any future endeavor.