How long has it been since the e-mail? I think you'd need to give it at least a 2-3 weeks before breaking 'dark', but on the other hand I wouldn't see an issue with including him on a group e-mail. He can still choose to respond (or not), and it's not as though you're pursuing by sending tons of e-mails all the time.
The one thing I would emphasise, though, is that just because they're not in contact doesn't mean they're not thinking about you. I bet he is, but is consumed by guilt and himself so doesn't get round to making contact. Being natural and including H on a group e-mail can't hurt though. If it was my sitch, I'd just do it, being prepared to not have a response, and to try again if I didn't get one.....
