There's a guy at work, he's in a senior management position. I've kept my distance from him since he came over a bit creepy at the work Christmas party. Since then, he emailed me a few times, kind of flirty things, intimated that he wasn't that happy with his home life (married with two very young children). I ignored the lot, but it came down to the fact that I had to spell out to him very clearly that I am happily married. 
I've now found out that he is shagging a (24yo young for her age) girl who works for him - he is her line manager. I just see it all ending horribly for her and him walking off scot-free and it makes me sick. I know there's nothing I can do... AIBU to wish bad things on him?? I honestly don't know why this is bothering me so much.