Most Helpful Guy
Find another job if that's a possibility. I'd kill myself if I had to work with my ex. Like super serious. I couldn't do it to weird and uncomfortable...
Most Helpful Girl
Its your ex and because you guys aren't together there is no other way he's supposed to act. Ignore him and focus on what's more important because he only acts because he's receive. If he's receiving an audience reaction which is you then he'll continue the show which is his pettiness.