I'm interested more in the philosophical perspective, rather than the evolutionary aspect like Robert Trivers presents.
The "self" is a difficult concept to pin down. For example "so I say to my self, self?" and we are at an impasse already.
Deception on the other hand most explicitly involves a "you" plus "another" and by definition must include another...a "co conspirator" or "partner in crime" if you will. In theory that could be your "self"...there are actors who play multiple roles in the same movie...most famously Peter Sellers in Doctor Strangelove. But I know of no time during that movie when his various "selves" conspired directly per se...although they all were discussing the same subject in different contexts namely "Mutual Assured Destruction" and the Atomic Bomb. He played the hapless President, the hapless British Air Force Colonel and the deranged Dr Strangelove...so it does make for an interesting introspection on points of view ceertainly "conspiring" in a sense to stop the dropping of an Atomic Bomb on Russia.