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How important is it to know all the secrets of your spouse's past? Be sensitive and don't force him to share thing he doesn't want to share. If God has forgiven him, allow him to choose the things about which he's willing to share.
The boomerang generation - it's when your older children leave but then move back home. This can be very challenging for the parents. Don't be afraid to talk to other parents who can share with you how they were able to handle it.
What is the loving thing to do when your adult child moves back home? Establish time limits to their stay. Formulate a financial agreement. Respect the need for privacy.
If you feel like you're wrestling with God, don't give up.