Easy. Justing is doing what he can to make it successful, but as a founder there are only so many things you have control over, and sometimes things don't go as planned. You should not attach an ego to the outcome of a company.
If a company fails, you might feel that you've let employees down, but as long as you've hired great talent, and you live in a time and place where they could find a new gig, they will. For investors, this is just one of the many companies and failure is expected. They are not going to be broke because of one company failure. Clients and customers will also find a new home. Overall, life goes on.