How do you know when you're in love?

How do you know when you're in loveis it the crazy things you dois it the fact that my heart skips a beateverytime that i think of youIs it the fact that I can't sleep at nightwhen your image is in my headOr is it the fact that I can't stop smilingafter every word that you've saidIs it the need to hold you in my armsand keep you there foreverOr is it the fact that I wrote you a poemand sent it to