"Haven't you read," he replied,
"that at the beginning the Creator made them male and female and said, '
For this reason a man will leave his father and mother and be united to his wife,
and the two will become one flesh'?
So they are no longer two, but one.
Therefore what God has joined together, let man not separate."
Of course Satan is going to attack your marriage, it is a good and perfect gift from God. God wants to use you and your spouse to bring glory to himself through your ministry to the church, your ministry to your friends, and your ministry to your children or future children someday. Study the Bible and you will soon find that God likes to bless people through generations. Those generations start with one marriage, wholly and fully dedicated to the Lord.
Read the book of Ruth and you will see her God-fearing love for Boaz is what gave them a marriage that glorified God vibrantly. Not only did God use their marriage for his glory while they were alive, but he blessed their children and their children's children, all the way down to through the lineage of Jesus Christ himself. Kind of reminds me of an old country song, "All because two people fell in love..."
Don't let the romance get to you though, ask any married couple and I'm sure they will tell you how hard marriage is every single day...mostly because Satan doesn't want their marriage to glorify God. It would be so emmaculate that he shutters at the thought of it. Learn to fight off Satan so God can be glorified!
If Satan is attacking your marriage you better get up and fight before you lose this God-honoring opportunity! Ask God to show you how to fight, how to love, and how to humbly walk with Him. Pray that the devil would be chained so that he no longer has a presence in your household. Seek Godly advice from strong Christians around you.
And if your relationship is not being attacked, perhaps you should ask yourself: are you glorifying God with your marriage? Doing nothing at all is the same thing as not honoring God. What can you and your spouse do today that will bring God honor and praise in your home? Who can you help? How can you show your spouse the love of Christ through your actions?