How do you know when a boy really means it when he says I love you?
A boy will say it, a man will show it
That's the scary part. You can't tell. Just have to trust.
With a ring a life and all the patience he needs to prove he will wait patiently while still Loving you. But patience requires Selfcontrol which he has shown none if you are all lovidovi all the time.
if he says it while looking into your eyes or before you guys have sex for the first time and you havent talked about doing it at all :)
I'd look the girl straight in the eyes and say it and something se depending on the situation;D