As for the ruining your friendship with the founders, not sure you can avoid this. To me if they de-friend you for pointing out facts, then they were not your f

As for the ruining your friendship with the founders, not sure you can avoid this. To me if they de-friend you for pointing out facts, then they were not your friends in the first place. I am still very close friends with one of my ex-cofounders. Maybe that my comment is pessimistic, but from my perspective start ups are an experience in failing. The difference here is, if you choose to continue failing with these 'friends/cofounders' or make a call it quits. 13 months is a short life of a startup, but really this is the decision that you and only you can make. No one but you has the perspective and knowledge to make such a call.