Molly, You do not contact him. Continue living your life as if he's never going to return. You are now flying solo. If he decides he wants to come back to you, then so be it, but for now, you need to continue moving forward. Nothing says you have to shut the door...leave it ajar, but do not wait on him. Life is far too short to be sitting around waiting to see if he'll wake up.
Start making plans for the new year and make a list of those things that you would like to do but never had the time to do them.