<human>: Can you condense the text into a few key points?

Shit, where do I start? Throwaway because I feel like a terrible human being.

I met this guy about a month and a half ago, we have been dating for about 3 weeks now. I met him through a mutual friend. He's really nice, good-looking, and we have a lot in common.

About a week into it, he accidentally 'reveals' (unbeknownst to me at the time) in conversation that he has his child the coming weekend. I was taken back. He said he assumed I had known since we were friends on Facebook for a little while. At first, it didn't bug me whatsoever. Why should it? However, as time goes on I continue to mull it over in my head. I'm freaked. Everything is telling me to RUN away fast. I haven't seen his kid personally, only really know his name... 

I have no idea what to do, I am at a total loss as to why I feel this way.
<bot>: met a guy, dated for a week until i knew he had a kid. now i want to run for the hills. help?