I have met people like that and they are definitely a problem but I don’t think he is suffering from an insecurity complex or lacking confidence because most people that have an evil soul have a very high level of confidence which often borderlines on Megalomania (think Lex Luther – so-called evil genius and greatest criminal mastermind of all time.) It does sound like he is jealous of your position though and he could be trying to steal it out from under and if that is the case you should report him to your boss as another member suggested because it is a very sneaky way of bullying you and if he keeps it up after that take him to the side somewhere and tell him how you feel and to **** off.

Nobody needs to put up with ******** from other people and if you let him he will walk over you.