He overshares a lot
His 'I am now Single' post was long and sounded too needy to me, just not something a grown man should put all over the Internet IMO
Why do you care?
I don't think I would do as he is doing but that doesn't make it wrong. And who knows, anyway, since my dating was way before social media.
Honestly people get all judgey and annoyed over the silliest things. The only opinions that would matter in the situation given are those of the people dating. If you don't like it then "hide" the posts. I doubt you will though because then you couldn't complain about his 'oversharing.'