Get off Facebook...it's a festival of passive aggression and immature acting out.
The police have other things to do than track down people being snotty to each other online. Unless this person threatened you with physical harm and knows how to locate you, it's not a police issue.
There will be another drama along any minute that will take the spotlight off yours. Try logging off and going for a walk...I find I usually forget all about it by the time I get back.