Why was my ex so hurtful when he dumped me?

Him and I had good times but as time went on we started fighting a lot on WhatsApp which was very time consuming. Today I told him that I was very hurt about something he said earlier. He denied it and played the victim and kept telling me that I’m making things up. He kept telling me that he doesn’t need me, that he really regrets meeting me and being with me and that he is looking forward to the time without me. He repeated it about 4 times like, dude, I heard you the first time. Why would he feel the need to repeat himself and also to be so hurtful about it? He could have just said something like „I don’t want to see you anymore due to Xyz“ but no he had to tell me a thousand times that he is so much better off without me. Me personally I don’t regret meeting him I just regret arguing with him but I still cherish the good times we had.

Why was my ex so hurtful when he dumped me?
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