I have a girlfriend who I've been going out with for nine months now, and everything has been going great. But recently I've been feeling very torn because it's hit me that I've got feelings for a girl I've known for four years, and is also my best friend. She is in a relationship too, but sometimes I get the vibe that she feels like this too. I'd usually go to her for advice on what to do, and I don't want to cheat obviously so anything from anyone would be greatly appreciated