Why would my ex try to hurt me when he doesn't even want me?

My ex and I stopped talking a long ago.. months.. after he dumped me. He now has a hot girlfriend and he's moved her in with him. she's met all his friends and he's shown her around. He called me recently and he said he was curious to see how my life was going. By my mistake, I honestly told him everything. He did nothing but criticize me the whole time and tell me I wasn't "pretty enough" to do anything. His advice was stuff he felt was better for me. When we were dating he told me he was from this popular city and everyone there is attractive and that my face wasn't attractive but my body is. I haven't called him since the breakup, why rub it in my face.

Why would my ex try to hurt me when he doesn't even want me?
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