"5. He's really concerned about the details.
On the big day, you can bet your guy will be ridiculously nervous. "Even if he's certain you'll say yes, he's still anxious about whether or not he'll be able to pull off whatever it is that he has planned," says Parrott. If he's typically laid-back but freaks out about being on time to dinner, or he's borderline aggressive when he insists you order the chocolate cake for dessert, it's possible he's got something sparkly up his sleeve ... or least in a little box in his pocket. "