You posted for help and understanding, everyone here has given good advice, please heed to it. And from what I read, the way he has been acting at work, has shown others that he is the one causing trouble by trying to agitate you. Do Not return text messages as already told. Do Not call him, no matter what. Save all messages whether its text or voice, record in a journal all things that is said and happens as already told. He sounds like the type that wants you but does not want you, in other words, narcissistic personality, all for self.