Why would someone forget to read a message or intentionally leave it unread?

Anonymous
For instance, I text a guy, we converse, and then my last text is never opened/read. Yes, what I said didn't need a reply and closed the conversation- but isn't it normal to read a text if you care? This happened quite a few times, but the last time, he actually replied 2 months later like nothing happened. What does it mean?
Updates
+1 y
What if that person was also adhd?
Why would someone forget to read a message or intentionally leave it unread?
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