Is this a mean thing to do?

I hung out with my friends with benefits for the first time in person. Prior to that it was just casual chat and flirtiness for a couple months. On the third day I just decided to block him. On my phone I noticed a voicemail and it was from him asking if everything is OK. I did not know you could still receive voicemails even if someone is blocked. I also looked on Facebook messenger and he asked me if I was OK? It feels mean of me but I don’t really think I owe him anything?
Is this a mean thing to do?
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