I dont understand you are complaining that your EMPLOYEE isnt doing 100hours weeks when at the same time you, the CO-FOUNDER, were in "honeymoon for most of May" [1] ???? WTF!
When a launch is imminent and you are a CO-FOUNDER, and you take a vacation, this is grossly irresponsible. The whole "life happens" comment he uses as a minor defense to it, well....guess what? Work is a part of life too! We juggle work, home, family, friends, hobbies, etc etc all the time, and it's up to us to be responsible on deciding which gets priority at any given time. While one aspect is more important to each of us, there will always be times when something trumps it, regardless of category. And well, a launch of your business compared to going on a honeymoon? Yes, absolutely that trumps it!
A honeymoon can be postponed. I've had many friends that postponed it an entire year! Sorry, I simply cannot find justification for this single act alone.