Ignoring my message? Why?

Anonymous
I've been messaging a guy I like on Facebook for a few weeks now. We're not friends on Fb so it's really just messages.

There's days when we send hundreds of messages back and forth having amazing conversations and then there's days where we don't talk at all because he takes up to 2-3 days to reply.

When I ask what took him so long to respond, he apologizes multiple times and says that he's been busy since he has a full-time job and a girlfriend (don't judge, we're just writing) with whom he lives together.

The night before last we were writing again but at one point he said he was going to bed soon and then stopped answering, usually he says "Good night, sleep well" and stuff before he's off to bed.

He read my last message then the next morning, which was yesterday, (Facebook displays the time the person read your message) but didn't reply so far, plus I noticed just now that he marked my last message as unread (the "seen: xx:xx" notification is gone).

So why would he do this and not reply, he obviously looked at my message at least twice? His girlfriend doesn't know anything about me, so should I pay more respect to the fact that he's not always available for me? Does he not really want to talk to me after all?
Ignoring my message? Why?
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