I knew my startup would fail, because as a founding team we are completely dysfunctional. Yet, I stayed and worked for over a year because I really like my co-founders. Now I think it’s time to go, but I’m not sure how to break the news.

They're probably wondering how to break the news to you that they're quitting. It's one of those situations where everyone likely hates working on the startup but no one wants to be the first to quit on the rest. I'm sure they'll understand.

Honesty won't ruin any relationship. Plus, startup is about being excited about what you do, if you are not anymore (for any reason, this time the team) then it's better for everybody to move on. I had a similar situation with my startup. Co-founders visions were not aligned on many things, we tried to stick together to make it work, until everything broke. Fortunately, we preserved friendship.

Do you have any traction? Just site the lack of numbers as time to move on.

Yeah, this happened to me. Better the earlier you leave. You'll be bitter you wasted your time, and it may poison your friendship.