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Communication is the lifeline for a growing marriage. So what do you do when your spouse won't talk? Don't condemn them. Instead, ask them questions about a topic they're interested in.
Intimacy is at the very heart of a growing marriage. God designed marriage to be the most intimate of all human relationships. What are you doing to build intimacy in your marriage?
Confession should ideally precede forgiveness. But if someone has sinned against you and has never confessed, ask God to help you forgive them anyway. This will allow you to rid yourself of the sin of bitterness.