Why did he suddenly turn into a jerk?

Anonymous
My ex and I broke up a few months ago and recently we have been re-introduced into each others lives. Our lives overlap constantly now with family, friends, and our jobs. Lately people have been approaching me about a huge change in my ex's behavior. The once sweet and funny guy has turned into a huge jerk. What happened? Apparently its been going on for awhile and I don't feel like talking to him about it would do anyone any good.

What would because him to pull a Jekyll and Hyde and act like a total douche bag to everyone he knows. Even his friends have commented on his out of character behavior to me. I'm just curious and any insight would be appreciated!
Why did he suddenly turn into a jerk?
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