He's toying with me, why?

So, last night I'm at work and the S.O.B. is outside in the parking lot. There are 100+ other places he could have gone. So why, why does he have to go to where I am? I'll share a little history. We have worked together for the last 4 years. ( For this reason I never understood the accusations about me cheating. We were together 24 hours a day. When would I have found the time? Especially if you factor in that I was not allowed to go anywhere by myself). I didn't feel threatened but mad as hell. It's like, haven't you done enough? You have to still come around to my place of employment and make your presence known? Must be little man complex, IDK.. I mean, when he left, I didn't go looking for him. I didn't bother him at work. Honestly, in the past, yea ,I would of gone and started some crap. Made a scene. Today? I don't have the energy or the time for his dumb ass. And that, my friends, is the honest truth. It was over way before it was over.