What does it mean when a guy says you're his "best friend"?

Ok, what I mean is when a guy says to a girl "You are one of my best friends" or "You're my best friend" Does he actually think more of you? Like when a guy says that does he mean something deeper than what he says? For an example when he says it does he really mean he likes you as a girlfriend? Or is it just merely you're his best friend and nothing more? Just curious, I am not serious about it, I just don't know if guys say these things to almost give the girl the hint that he likes her more than a friend and wants her as a girlfriend? or if he just means you're his best friend?. Please Answer! I am so curious! Thank you! :)

What does it mean when a guy says youre his best friend?
What does it mean when a guy says you're his "best friend"?
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