Here’s how it felt in the weeks before I resigned from my last startup: I couldn’t sleep. I couldn’t eat. Resting pulse at 120. I had reached a point where I couldn’t agree with my co-founder
<b>Editor's note:</b> <em>Mike Knoop is co-founder of Zapier.</em>
In the summer 2012 batch, one in four Y Combinator companies lost a founder. It's not hard to conclude that startup co-founder dis