You are making great strides in detaching and living your life for you and your son.
Your story isn't done yet. There are many things that can change the course that both of you are on. It's still early in his crisis and no one knows what the future holds. As you grow and the days go by, you'll discover that you are just fine on your own and you'll begin to write a new chapter in your book of life. It's okay to think of the past, but don't stay there too long. The future isn't ours to see just yet...but the present is a gift...use it wisely and you'll be just fine.
You are doing great!
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.