Lisa, always hold your head up no matter what. The only thing you, we LBS can do is just better ourselves for ourselves. Please continue to be stron and get stronger. It's good that you see that the problem in your marriage was longer than you thought. Find yourself, be yourself, it's the only thing we can do. We both know what these forums is about. Support and to show us the best way to handle our sitch. Gal and detach too. We just need to prepare ourselves for the worst so we can depart with strength. One thing for sure is when and if we do depart we would know within ourselves that we did everything we can to save our marriage right? Otherwise, why are we here on this forum...divorce busting. Stay your course and think about yourself now. Get out and have fun with friends.
How should you communicate with him? Ask yourself, does he deserve you to be there for him all the time? You will find your answer on how to communicate with him.
Has he mentioned D? Or is this just a S for time and space? If he hasn't mentioned D, then leave it at that. When you're strong and got a new life, then handle it then. It's a long road ahead. I read some other threads and some were able to save their M after two years if DBing. So dont rush it. Like they say here, our WAS us giving us the gift of time. Find your happiness and strength without him. Find it for yourself girl.
As for going to see his new place, I wouldn't. I feel like he ask you to so he can get comfort for himself that what he is doing is ok with you completely. Please don't be so available for him. Let him start to miss you. Have you read the LRT? You should if you haven't. It even tells you when you should use it. Most importantly, you need to be at a place where you are strong enough to use it and accept either outcome.