Dating: He hasn't replied, am I over-analyzing?

I have been facebook messaging this guy I went to primary school with for 2 ½ weeks. We are 25 now. He ended up coming over on Saturday night. I made dinner, we watched some movies, drank some wine and he ended up staying. We had a really nice night.

The next two days we have been messaging like normal. Last night he sent me a message and I replied. My reply wasn’t a question.

It was something along the lines of:

Him: Working 6 days straight?

Me: Yes, but its worth it to have a 3 day weekend

Him: You weren’t saying that Sunday morning (when I had to leave for work and he was still over)

Me: Haha well you have me there..

I can see he has read the message but hasn’t replied to my last message.

On one hand, I figure it was late at night, I didn’t ask a question and it was just the normal end of a conversation.

On the other hand, I’ve convinced myself he is no longer interested and I am never going to hear from him again.

Am I being crazy?