Get to a lawyer as soon as possible and have papers drawn up that stipulate exactly what will be done when you separate. They will promise you the moon and when they are out of the house for a bit, all of those promises go away. Now is the time to get something in writing because he wants to leave so badly and will most likely sign anything you put in front of him... do it the legal way and be sure that you ask your lawyer about direct deposit of all funds from him to your new bank account. That way, you aren't waiting around for late checks, etc.
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.
