She invited me yesterday to a bar with her friends (her ex was also there) who I didnt know.

Me and the girl arrived and the she said hello to everybody. I am a very shy guy, so I am standing there and just looking around, since I did not know anybody.

Her friends came up to me and introduced themselfes. After 2 hours went by I decided to leave the bar, because she had fun with her friends and I did not want to be around to just listen.

I left and wrote her at home „I am at home. I think you have more fun with your friends alone. Also I dont want to follow you everywhere around.“

Today she is mad at me because I left. But I am really upset of her, that she invited me, but didnt interact with me. I just stood there, knowing nobody, just listening to them having fun.

What should I do? She will fly tomorrow to a friend in Norway for 4 days. Silence? Take attention away?