I'm quite shy too, and I wanted to rectify this trait. So, I tried Toastmasters. It helped. Even though I am still somewhat shy, I can now speak in public, and interact with strangers a lot better.
If people ask about H, just say, "Fine, as far as I know, we're separated," then change the subject.
I'm not sure about approaching H now as Robx suggested. You already did do so, and he gave you his answer. Perhaps, a little bit of space might be needed, then communicate in a general way. I don't know ... I think he may be using this time when you raised divorce as an excuse. I still think there may be an OW. If there is then it changes the dynamics of how to proceed.
Me:57 H:52 M:28 Got another lawyer last year and filed. D35,S/D twins28,D22 EA4/04 End? Who knows? "Life is like a mirror. Smile at it and it smiles back at you." — Peace Pilgrim