Hi London,
So sorry you are in so much pain. I know what you are talking about.
His posts that you mention don't sound like those of a grown man.
Sounds like, although he may be sober, he hasn't changed much. Talks a lot then turns around and acts like an ass.
I know it's hard but at least for now, for you it may be best to distance yourself as much as possible. Please do reach out for help, daily open AA meetings, Al-Anon, grief support groups, whatever it takes to help you through.
Keep posting, try not to isolate yourself.