Is you're my best friend correct? Or your my best friend?
You're my best friend is correct. Your is possessive, as in this is your table; you own the table. You're means you are.
You're my best friend is correct
You're my best friend. (short for you are)
You're is a contraction for you are. Your is possession as in, That is your dress.
You're my best friend (You are)
you're .. this is first grade logic.
You're is a conjunction combining the words you and are. So you're (you are) my best friend is correct. Your is possessive. So if you said 'Your best friend.' That would be correct.
"I'm your friend, but you're my best friend." First instance is possessive, and second is a contraction of "you are".