Originally Posted by nycindie
I think that he probably thought that telling you might've hurt your feelings, and so his first inclination is to protect you from hurting, coupled with protecting himself from any possible fallout.
I will have to say, it is usually not to protect the person being lied to (although they may use that as a justification once they get caught), but it is definitely to avoid dealing with the possible fallout. It is purely selfish. Sorry, I know that sounds really cynical.