Ex boyfriend sending insulting text messages?

Anonymous
We dated for 10 months. Broke up less than 2 weeks ago. We broke up over a fight but no one really did the dumping he just assumed it was over.

Anyway, I've been trying hard to be friends with him. But today we got in a fight and he sent this:

"You need to realize who you are talking to because I'm not going to let some little annoying b**** talk to me that way. I don't even want to talk to you so stop f***ing texting me. Oh, and also I did have sex with Hailey that one night. Alright. Bye."

Hailey is his friend. And he's talking about a party he went to a few days after we broke up. But I didn't even say anything bad before that. I texted him back after that, no reply. At that point I was just done so I texted him again and I said:

"This is my last text to you. I just realized how much of a jerk you really are. And I think I'm a great person. I'm pretty, I'm nice and I'm caring and I deserve better. I'm glad we broke up cause now I can be with a good guy. Your # is deleted now. Have fun being a jerk. It won't get you anywhere in life."

He sent this:

"Thanks b**** (: have fun being a whore. It'll get you places. I'll be successful, whether you like it or not. I'm glad I broke up with you too."

and then I ignored that. I don't plan on texting him at all anymore. I deleted his number, his AIM, his pictures on my computer, his email.

Why the heck would he treat me like that? That's terrible. He texted me that after I said I was finally starting to move on. He's never acted that way before. And he used to be one of my best friends.

So what does those kind of texts mean? And what should I do? That stuff really hurt cause I was always 100% there for him.
Ex boyfriend sending insulting text messages?
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