How can you tell if you're in Love?

At one point, we're all asking this to ourselves 'Do I love her/him?'..How can we be sure that the feeling is love and not just a crazy crush? I was given the idea that when you're in love you're:

1) Happy all the time (can't dispute that...)
2) You gain weight way too easily (A++ to that!!)
3) A sense that somethings not in place when the person's not nearby. (YEAP)..i miss you!
4) Wanting to be together all the time (yeahhhhhh...)
5) Want to hear their voice 1st thing you wake up and the last voice before we sleep (So True!)
6) Craving for sweet stuff? (ahh, thats just my sweet tooth cravings...hee hee)

Well, if you answered atleast YES to three..then you are in the boat!

All the above are the author's opinion on what love is...