My best friend has developed an awful attitude?

She just got out of a really bad relationship.
He was mentally abusive, and not only caused problems in her life, but he went out of his way to cause problems with all her friends. He harrased us, threatened, us, etc. All her other friends stopped talking to her, but I stuck by her.
They broke up, and she started dating other guys. Now she's sleeping around a lot (unsafely) and has become so full of herself,
She puts me down, and talks about how hot she is all the time.
Is this some kind of side effect from the toxic relationship she was in? Her attitude seems like it's only getting worse.
My best friend has developed an awful attitude?
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