ok Loote,

 .. seems the problem here is the use of qualitative term 'best' or 'good' friend. Different people are taking these terms at different level. How best is the 'best' ? It is rather a vague term - and is the reason why you not agreeing with me.

I got this feeling cuz you are considering a relation with 'gf's friend' or friend's friend  as a 'close' one which, for me, is not 'close' in my scale. Let's first make this demarkation clear so that we all measure this word 'best' at the same scale.

Again, let me repeat - 'a best friend is one with which you share your personal problems, feelings and trust, and if you are at this level with a girl, this means you are already into the domain of sex.'

Corollary to the above theorem: "A relationship between a boy and a girl outside a domain of sex can never be a 'close' one." 

 lol..