Congrats on sticking it through! This apparently happens more often than you'd think. I went through a similar experience a couple years ago:
<a href="http://brandonb.cc/what-happened-when-my-co-founder-quit-the-night-before-our-yc-interview" rel="nofollow">http://brandonb.cc/what-happened-when-my-co-founder-quit-the...</a><p>EDIT: I commented before reading the whole thing! Glad the blog post helped. And I'll bet your story will in turn help others. :)<p>I'm really surprised two YC founders gave you advice to throw in the towel. Doesn't seem very YC-like. Glad you didn't!
I swear there was a comment here earlier--did they delete it? Hey! Any comments? This was my first stab at writing a personal blog post and the most difficult for me. I hope it helps everyone keep their head up!!
Presumably you told your co-founder after his email that you've actually secured $100k in funding.<p>What was his reason for not coming back was financial concerns and general uncertainty? I would imagine $100k would solves both of this issues for most people.