how do you know when you really do love someone?

when i'm wake up and you're i am first thought and i'm looking at my phone to see if you have text or called me while i am asleep. &when i go to bed, i fall asleep thinking about you. When i miss him, even though it hasn't been more than a day or so since i've last seen them. but mostly, when i put him needs before my own. when his happines is more impportant than my pain. when i really love someone i am willing to give it your all, and i'll know when you are