My best friend of all time chose his girlfriend of 9 months over me?

Anonymous
I considered him a real brother. By that, I mean a REAL brother, someone I can tell everything to and lean on in times of need. But I found out recently that he has talked about some really private stuff about me to his girlfriend whom he has been with for 9 months. His girlfriend spread rumors about it, and he became angry when I confronted him - since then, we haven’t talked in weeks. I feel completely and utterly betrayed. He was really like a brother to me, felt like he was a part of my family. I don’t know how to feel. Am I in the wrong? Is it normal for a man to prioritize his new girlfriend over someone he has been so close to since young? I know for a fact that I would be willing to drop any girl if I found out she was badmouthing my brother.
My best friend of all time chose his girlfriend of 9 months over me?
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