Thanks! makes sense also.
From a girl point of view, i wouldn't want my boyfriend to have
a close relationship with another girl, especially sharing his
emotions and stuffs.
I felt that these kind of
things is only best to share them with your girlfriend, she is
supposed to be your bestest friend. And afterall your girlfriend is
the only one who will truly be with you through up and
downs.
Just think from another angle,
what if she is the one who has a close best male friend and share
everything with him, even the quarrels between both of you. Won't
you be as unhappy about it too?
However, i guess it's still up to you to think through it and
decide who is more important in your life. 
