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What is love? Some might think it's the feeling you have when you're "in love". But those feelings are temporary. True love is an attitude and action. Read I Corinthians 13:4-7 to see how the Bible defines love.
You as a parent need to acknowledge that you cannot control your adult children, but you can influence them in a positive way.
When a guy says, "I don't love her any more", it usually means he's lost that euphoric feel of being "in love" when he first got married. Love isn't a feeling, it's an attitude and an action.
Money can be a big contributor to conflict in marriage; but the biggest problem is a poor relationship.