Why does my ex boyfriend act like a concieted manwhore after breakup when he was never like that at first?

Anonymous
My ex was really sweet and respectful while we were together and its like now he's acting like a manwhore, touching girls innapropriately all the time in front of me, acting concieted, even my friends have noticed... has this ever happened to you or anyone you know and do you know why?

Updates
+1 y
We've been broken up for about 5 months but we haven't seen eachother since everyone at work told me he turned into a manwhore, i didn't believe it until i witnessed it today, he was touching girls butts and flirting with them and hugging all over all of them and acting like he was all that, when i first met him he was shy and sweet now he's an asshole..
Why does my ex boyfriend act like a concieted manwhore after breakup when he was never like that at first?
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