Just because you're married doesn't mean you can't flirt with your spouse and still court them. Tell them how much you love them or how attractive they look. Drop a pick-up line or two. "Did it hurt when you fell from heaven?" Ha - okay, it may sound corny but your spouse will appreciate your efforts or above all else get a good laugh.
Never let the sparks die out. Take your spouse out for a date and if possible set up a date night schedule. This will allow you to have quality time together and reconnect after a hectic week. Having alone time will help you appreciate each other and unwind from everyday stress.