如果要表达的是友情，那可以译成
You are my best girl friend.
You are my favorite girl friend.
如果要表达的是爱意，那可以译成
You are my sweet heart, honey.
You are the best girlfriend of mine.
楼主不是要表达“我所有女朋友中最好的那个”的意思吧？那样的话就说
You are the best one of all my girlfriends.
You are the best girlfriend I have ever been with.
hehe
u r on the top list of my girlfriends.
girlfriend, you are my english.
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