Is my girlfriend overreacting to me saying happy birthday pretty lady to a friend?

I have had this friend for well over 10 years. On her latest birthday, I said, happy birthday pretty lady. Meaning was just being nice. My girlfriend exploded. I understand why she got upset, offered to take it down, but I am the worst boyfriend of all time now. Is this reaction warranted?

Is my girlfriend overreacting to me saying happy birthday pretty lady to a friend?
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