Your response was very honest and I'm glad you took some time to think about my question. I knew it wasn't going to be an easy one.
I know you love your h and you believe strongly in your marriage vows. I liked your response about going your separate ways peacefully. If you two opt to go your separate ways, he will think about you, the marriage and as a family for the rest of his life.
In my opinion, he's been testing the waters a bit and trying to convince himself that you are far happier w/o him in your life. Some of them say this quite often, especially once they return home and begin working on the new marriage. I'm not going to get your hopes up w/my next comment, but I can't help but wonder if he's been thinking about "home and what all it entails". Right now, he's still wearing rose colored glasses and doesn't think anything will change, so he's talking out loud and wanting to get an idea where your mind is at the moment.
We don't realize it, but they all have given us a gift of writing a new chapter in our loves, the freedom to do whatever it is we want to do, to meet new people, find new jobs and relocate. The gift of time works in mysterious ways...but the true key is in how we utilize that time. Mleigh, you've come such a long way and your h has a lot of catching up to do. You've changed in many ways and yet, he's still stuck back in high school and maybe trying to grow up...but his clock is still moving ever so slowly and it's going to be a while yet for him.
I think you are a very wise woman to choose happiness and to live your life for you and your son. You have so much to be proud of. As I mentioned above, you've become even stronger, more independent and self assured. You have a beautiful son who adores you and just think, when you smile, the world smiles w/you. The time will come when a decision will need to be made about your marriage, but I don't think it's today, tomorrow or next month. When the time is right to decide...you will know.
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.