Dangerous Obsession?

Im not trying to sound concieted but im genuinly concerned. im a bit worreid about my ex. namely he slept with soeone else four years ago t make me jealous. got her pregnant then tried to get me back but i turend him down. he wound up staying with her as a result of my refusal to take him back. fast fwd 4 years later. he tracks me down on Yahoo, confesses his undying love. then he reads all my YA q's (diff accnt). then he says he is marreid to this girl who is a supermodel. sends me a picture. i find out he got the picture of a ggw website, its not real. he also lied about being marreid (public records chck) he lives with the girl and they are not married she is 300 pounds. I dont understand why he would lie. he also tells all kindsa lies to impress me like saying hes got a great job*(when he doesnt) i gave up and told him to stay away and then i start getting prank calls. Is this guy a creep??? is it me being concieted or is he just liking me or is it so creepy i need to worry?