No one has better instincts than you, as you will so handily prove today when you whip off the mask of someone who's all talk and no action. Be generous when you reveal their true identity. Chances are they were just trying to impress you anyway. There are many mixed signals coming from a friendship you thought was solid. Again, trust your instincts on this and consider that this person isn't always the best at communicating. Ask them what's up and get to the truth.