Book excerpt: But just like there's no hard and fast rule for how long it takes to fall in love, there's also no hard and fast checklist for knowing if what you're feeling is real. Some people know after a while; Others experience feelings after small gestures over months or years. But there are common (and scientifically proven) signs you might be falling in love...that let you know you're living a real version of your romance. For example, you feel the need to share the smaller moments of the day with your partner and you may find that their interests suddenly become yours. Or you can just start rearranging your schedule to give your partner more time. And of course, you might start wondering - maybe even dreaming - when your loved one will admit they love you too. Here are the classic signs that you're falling in love. Now all you have to do is prepare to say the big three words.