I'd like to think that Henry didn't come back either due to he had his own life or he could have been shell-shocked. As far as I know, it's indefinite to tell when someone might be brought out from their trance.
I believe I’ve answered a similar question before regarding why Henry didn’t return to the studio, but basically, all you need to do is to read into these panels:
When Henry left the studio (regardless of the fact that it wasn’t by choice), Joey basically told him to never come back if he left. On top of that, it HAD been years. Henry lived through a war, and when he got back, he moved on with his life. It’s hard to get back into something when you’ve been so disillusioned, and especially so when your last memories of that thing involve basically being given the boot by somebody you’d thought was your friend.