Nope, no feeling.. treat her like a little sister.
Since you got no feelings for her, then whats so difficult for
you to let your friend go?
Now you have a girlfriend, then focus your attention and
effort on the one that matters most lah.
Your girlfriend is more important than your friend.
Your immaturity will ruin your relationship when you can't get
your priorities right.
the answer is very clear and simple.
You should have never put your girlfriend on the defensive. As a
boyfriend you have failed her.
perhaps your girlfriend needs to go and find a real man who
knows exactly what he wants.