Why would a guy get mad when you block him when you barely talked?

I don't know what we were friends with benefits, boyfriend girlfriend, I don't know. He lost interest in me a long time ago due to us arguing all the time but still stayed in contact with me for some reason. He would still contact me but barely. He never texted me back much only when he would make plans for us to have sex. He's been asking for sex for a whole month now and I reject him every time. He hasn't asked for it lately and barely texted me. I blocked him for two weeks and a half and decided to unblock. The next day he calls and explodes on me. It clearly hurt his feelings that I blocked him when i didn't see why when we barely talked. So he threatens to block me back. I gave him the doubt thinking maybe he did like me which is why he stayed and he was trying to get together so we can have sex last night. I asked if we could do something else but he wasn't into it, just sex. So I blocked him again after that.
Why would a guy get mad when you block him when you barely talked?
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