Why does he read my messages but reply hours later?

Anonymous
So this mate of mine is a flakey guy but pretty friendly. Whenever I send him a message, if he's not already online, he'll go online and read it straight away. The thing is most times, he reads it then goes offline 5-20 minutes later and replies 3-4 hours later.

I get it if you don't want to reply straight away or you're busy chatting with interesting people but why does he have to read it and let me see that he's read it if he's going to reply hours later. Is that normal?
Why does he read my messages but reply hours later?
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