Did u think he maybe wants to get my attention?

This guy i dated last year on and off, we finished just b4 xmas , we don't speak ( we work together ) and just ignore each other, but now he as started actin odd as, talking to my friends about what hes been up to ( he knows they will tell me ) when i ever go into his office, he seems to start talkin real loud as if to say HEAR I AM. i aint sure if im just paranoid or not, do u think he maybe wants for us to start talking again? Sorry another example. as i was walking out of his office he came over and started to follow me outta the door but i just carried on walking and ignored him as though i didn't know he was behind me