Very well said. You were not, nor are you now, the reason for him walking. The problem is within him and he needs to fix himself one way or the other.
Coly, live your life to the fullest. If he wakes up and realizes the damage he has created and wants to return, he will need to do the heavy lifting in order to convince you that he's recommitted to the marriage 100 percent. At the end of the day, you will be the one to decide whether to try again or not.
Try not to look back...look forward.
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.