Yeah, you're in a precarious situation now. Who knows what this guy is like. There are people you can't trust and that will tell your business just to get back at you. And this turd is calling you, showing up at your desk, asking about who you're talking to? After one gd cigarette break? The nerve.
Side note:
I need ot teach you how to blow people off. I'm really really really good at it. I mean, its like an art. One of friends used to marvel at it. Its like I have the ability to give the impression that I'm telling you what you want to hear, but I'm not telling you anything at all, but I do with a smile. Oh, the things I can teach you young grasshopper. I can ignore someone like no other too.