What are 3 stars in a triangle moving?

The other night me and my friends went on a secluded mountain at about 2am. We saw many of shooting stars and began to watch the sky above us for more. We suddenly realized that 3 stars were moving in a triangle formation. One star stopped and disappeared, while the 2 other stars went south in a line formation. I know it wasn't a plane, star, or Satellite because it was going way to fast for that type of distance. Also they would randomly change directions. Anybody know what this is? I don't wanna say they're UFOs..