Ok, long story, so please bear with me if you wish. Recently, our regular, full-time babysitter, (we have 4 kids and my wife and I both work full time) moved back over-seas. The timeline worked out that just as she was moving over-seas, my co-worker, (at the time, now ex-coworker) had just split with his girl. She is a mother of 3, 22 years, no education beyond high school, and has a 1 month old baby. Anyway, we thought we talk to her about watching our 4-year old for a few hours per day until I got home from work. Extra cash, (under the table of course) for her, cheap babysitting for us, win-win, right? She's all for it. Month and a half into this, her ex, (my ex-coworker), starts giving me shit for supposedly telling his ex stuff about him he didn't want her to know. Like, WTF? I was kinda friends with this guy, but, not friends-friends... So, anyway, he's now going around our city, telling people that I'm a Two-faced f**k, and spreading all kinds of lies about me, because his ex is babysitting our children; and doing a damn good job of it I might add... Anyway, I'm a pretty laid-back kinda guy, but this ass is really pushing my buttons, any advice on how to handle him? I'm concerned he's gonna go to the cops and make up some bullshit just to drag my name through the mud, so to speak...