Guy’s behaviour?

I have this guy, so actually, this guy is very reserved and kind and doesn’t get angry, so one day I was in a good mood and I texted him to prove 4+4=9 and now he said “ what is it?” I gave him the question again and he said “I asked….. what are you trying to tell me? I know it’s not about 4+4=9” and then he had an argument and then he blocked me, and long ago I said to him”I trust you” and till the day we had that argument he was lingering on it, and asking me why? I said to him and moved on , but he was still lingering and then after the argument blocked me? What was going on in this guy’s mind? Pls help

Guy’s behaviour?
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