These WAH act in ways that are astonishing to those of us in the 'right' state of mind. He is acting out for whatever reason that may be. Let him do his own thing and most importantly do not let others know what gets to you. Maybe you could politely ask not to be informed of things you do not want to be? Looking back, and you know all about hindsight, but I should have realized who my friends were and were not. I have gained some friends and lost quite a few but at the end I gained QUALITY not quantity. I realized who was really my friend and who would just call to 'fill me in' or get any details. My road home for H wasn't very smooth, I did try to leave it as smooth as possible but there are definitely some bumps in there that I wish I could change. I just want you to learn possibly from my mistakes. Figure out who are your friends: don't share details with people you cannot trust and follow your gut. It usually won't steer you wrong.
As far as your H. Let him go on his crazy ride. Who knows, it may end up back with you but that's a choice he has to make. Make the most of your interactions with him. Not about talking but just about your behavior. I know I've said this a thousand times and everyone is different but it really irked my H that I was dressed up at basketball, laughing, talking, on my phone quite often (usually texting my mom haha) but he didn't know... And I was always dressed nice, bit my tongue to force a smile and act friendly, short and always in a hurry to get the boys moving because we had things to do.
I also remember Claire saying to me. Maybe there is a place in your heart where you can feel sorry for your H. That he is behaving the way he is and hurting those around him. It is really sad if you think about it. That once such a great man has turned his life upside down