Is Glee Star Dianna Agron "Terrified" of Ex-Boyfriend Alex Pettyfer?

It's never pretty when two Hollywood stars break up, but the Dianna Agron and Alex Pettyfer split has started to take quite the gossipy turn.
We told you how friends of Agron's thought Alex was way controlling and crazy jealous, and now Us Weekly is claiming the Glee babe is "terrified" of her "psycho" ex-boyfriend.
Is it true?