Why is my ex acting soooo petty MONTHS after broke up?

I have to see my ex a lot and recently has been acting BEYOND petty. I kinda have to share an "work" space with him and he's just being so petty. Why all the sudden he wants to act like this? I thought I was suppose to forget about him and move on, but clearly he's can't set the example.
Why is my ex acting soooo petty MONTHS after broke up?
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