You're doing the right things for now, just keep it up. It's great that he called you, and I bet it felt good. Now resist the urge to call him a bunch of times. He called you. He may need to talk to you, and if he does, he'll call you again eventually, but in the meantime your mind should be on other things.
Again, that's easy to say and hard to do. Simple, but not trivial, as the nerds say. But I really think you've hit on something here, and often it helps to focus on one issue and just work on that one thing. Your one thing can be giving him space and letting him make his own decisions and use his own time. He may or may not respond to that by thinking about your situation and deciding that he's been causing his share of the trouble in your marriage, but you don't control that and don't have the time or energy to waste worrying about it. Spend your energy and time on yourself.
One more thing--there will be a time no matter what when you're working like crazy on this, and he seems to be making no effort at all. It will seem unfair. It is unfair. BUT if you persevere there are better times on the other side of it no matter what he ends up doing. Fair has nothing to do with it.
