From sweet to vicious after breakup/what does that mean?

I do not want him back nor I will take him back,but one thing that left me wondering .I ended with him because of no chemistry & I also had this feeling I was just a convenience. He was always extra sweet & nice.Would do just about anything for me. After I ended it with he turned all mean & a jerk, demanded the stuff he bought me back & said he was going to make my live a living hell & ruin my name in the new town we live in.

The sudden personality change had me wondering. What is your take on this? Was he faking the sweet & was hiding his true self?

We been together 10 times & broke up several times. Thanks for the help.
Updates:
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Also I wanted to add 1 day after we broke up , he was flirting with a lady I am kinda friends with, he doesn't know we are friends , she came and told me ,(she has a boyf) .So that pretty much tells me a lot.
From sweet to vicious after breakup/what does that mean?
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