How can my boyfriend break up with me, and seem totally fine?

When he was breaking up with me (he did it over text) i tried to call him several times to talk about it. He wouldn’t pick up. I told him “you are being so cold!” He replied with “I’m not being cold. I’m hurt” and then he blocked me. I don’t get how he can just break up with me so easily and heartlessly. He broke up with me a few months ago in the same cold way.
How can my boyfriend break up with me, and seem totally fine?
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