Why a hookup still follows me on social media?

So I had a one night stand with this guy I actually chatted with several days before actually meeting up. We shared pretty deep things with each others. I just thought he was really nice guy and thought we might become friends (nope not a couple, I don't fall for hookups) but after the night he started to ignore my messages. So I decided not to bother anymore and just let him be.

But this confuses me. Why doe she still follow my social media? Why does he watch every single Snapchat Mystery I upload? I don't get it. If he hated me so much he doesn't want to chat, why doesn't he just unfriend me?
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Why a hookup still follows me on social media?
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