What would you think if you were in this situation?

Today I was texting a girl who I had no contact with for over a month. She suddenly asks me if I want to hear her sing, and i say sure. So she links me to her youtube channel and shows me her video. I listen to it and tell her it was pretty good. Then she proceeds to tell me that she only shows it to her close friends, and that she considers me a good friend of hers. the thing is, I never considered her a close friend, heck I didn't even think of her as a friend only an acquaintance. I would just talk to her from time to time and invited her food only twice. but never really though of her as a friend. I felt weird when she said that I was one of her good friends. what would you think or do in that situation? tell her you never saw her as a friend? keep talking to her and try to become closer friends? what would be your reaction? i am a guy by the way.