Did he really message me by accident?

So there's this guy on FB that I had as a friend for a while, but i kinda forgot he was on my friends list because we don't talk. He's a friend because we go to the same school. So he just randomly messages me and then when I send a message confronting him about it he says that he sent it by accident. However, the thing is I've never spoken to him on Messenger before so how can he accidentally send a message when we have no chat history. So i keep messaging him and he keeps responding. Eventually I tell him if he isn't interested in me then he should just block me, and he does. So what was that about? Did he really message by accident or was he tryna spark up something?

Did he really message me by accident?
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