When is it appropriate to tell someone you're dating that you have a child? Perhaps it's best before you hit the 4-5 month mark, but this woman obviously disagrees. A man took to the r/AITA subreddit to ask Redditors their opinion on him walking out of a restaurant on his girlfriend's birthday, after learning via a random friend that stopped to say hi, that she had a kid. When he confronted her, she told him in other words, that it was none of his business. Things got awkward fast, and she excu…