Why would my ex block me?

I Ended things with my ex 2 weeks ago.. for reasons. I just couldn’t pretend anymore. I wasn’t into him anymore so did US a favor. He ignored me after I wanted to be friends. He then started watching my stories on snap but Eventually blocked me there. I asked him why on messenger then he blocked my messages 😂 but kept me on his Facebook. At the time I didn’t really post but after a week I posted a pretty picture on my story on messenger and I guess he seen it, now I’m blocked. Why? He’s never blocked his ex’s that cheated or didn’t even let him touch them but would USE him. When we dated he was sweet and caring and loving and he’d just stare at me as he drived and always thought I was so beautiful. He would post me on his page and make me his profile picture/cover, he’s never done that to anyone before. Guys always would pop up in my messages and he was jealous and hated that. When I came into his life I taught him how to stop letting people use him or treat him bad. He was the one that told me he loved me first. He’d do anything for me always. He was a great boyfriend but some things I hated. anyways, why would he block ME? but couldn’t block people that CLEARLY used him or cheated on him but blocked me which I was good to him despite me breaking up with Him?
Why would my ex block me?
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