GA, Do a search on the net for divorces in GA (if that is where you are living). You need to discuss this matter with a lawyer as the state of GA is very easy to get a divorce in. He can file and be divorced in 30 days, if you don't respond. Now is the time to get your ducks in a row and be prepared for this action.
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.