Why is my ex so hostile?

Every time I talk to my ex (we have to talk type situation) he always gives me attitude and is hostile lol He even tries to avoid me which is damn near impossible since we have to be around each other a lot. I understand I was upset too but I'm over it and since we HAVE to talk I just decided to be the bigger person but now he's just being immature and making things difficult for everybody else that is around us. Thank you !
Why is my ex so hostile?
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