My question to you is what do you want to do? Are you willing to hang in there for another 3, 6 or even 12 months to see if he turns around?
From your posting, it sounds like he's making some positive steps in the right direction. The comment he made about trust issues w/you...they are normal for someone who is dealing w/crisis issues.
Dealing w/someone in crisis takes a lot of patience, compassion and understanding. They can't just snap out of their funk because they have to work thru it. The crisis didn't just happen, it took years in the making and it will take a few years to work thru. If he is in crisis, it will take him quite a while to become more intimate w/you. Nothing against you at all, but his feelings toward you are "numb" at the moment. It's all part of the depression and if you read up on depression, they can become "numb" to many things, including having sex w/their partner.
Your h sounds like he's learned some valuable lessons from the Landmark education he's be participating in. Do you want to toss in the towel now that he's starting to warm up a bit?
You are the only one that can decide whether you stay or go.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
