Why would someone block me on GAG after a friendly, normal conversation?

I had a really nice conversation on here yesterday. Didn't talk about any controversial or sexual topics, just some friendly how are you questions. They said they needed to go to bed, then they blocked me. Why would they do this? I'm kinda hurt and confused because it was a really nice friendship we were building...

Why would someone block me on GAG after a friendly, normal conversation?
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