I'm currently in a very similar boat. This forum has been helpful and I'm diving through all the articles now.
Regarding reaching out to his people -- as mentioned previously, this is likely not new news to any of them. I made the mistake of reaching out to his mom to thank her for always including me in their family, etc., but letting her know he broke up with me and why. I also texted his best friend to inform him and ask him to check in on him. I'm sure you can guess the ugly texts I got from doing that..."Stop messaging MY PEOPLE! You don't have that right anymore," etc. He was on a 4 day bender, is functional today (which means just maintaining with shots throughout the day, and has already started texting me like we're still friends.
I'm learning that there is no way to remain in his life...it is just going to hold me back from finding what I deserve. Let me know if you ever need to chat. This is freaking devastating stuff.