'I. LOVE. YOU'

how are you suppose to know what kind of love the person is talking about?
people use this phrase all the time;

your my best friend
your my pet
your my friend
you said it to me so I am saying it back..
i am being completely sarcastic..
you are my family
you are my boyfriend
i want to marry you
you are my wife
i want to get with you

So when is it true love?
when is it puppy love?
when is it hopelessly in love, love? 
when is it 'friendly' love?
when is it die-for-you, love?
and when is it just complete bullshit?