the 'when' things.

when you constantly can’t stop thinking of her. when you wait for her to go online or when you wait for a phone call or when you wait for a text. when you see something and it reminds you of her. when you talk about her to your friends, a lot. when you start to read over messages, saved conversations or you replay moments of your life with her in your head. when you realize that when you are out, you look around to see if you accidentally bump into her. when you realize your friends get sick of you talking about her. when you listen to songs and you think 'this was our song'. when you go somewhere and you reminisce on what happened there with her. when you think of her before you go to sleep. these are the 'when' things, you know you have fallen for her.  

                                                                                            were it so easy meaning?