<human>: Can you condense the text into three sentences or less?

Context is massively important in this story. Me and my girlfriend have been really close friends for about 6 years, to the fact we used to call each other brother and sister. We stopped doing that a few months before we got together and well we got together. She said it again the other day when we were going somewhere. 'Shall we go bro?' however immeditedley said 'Oh that was weird' Ive been worrying about it ever since, maybe she doesn't see us as gf/bf anymore and has reverted back to thinking of me like a brother? What do I do?

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<bot>: ] GF called me brother, and its confused me a little bit. Am I overreacting at a slip of the tounge or could there be more to it?