You can never really be sure of your co-founders personal goals or priorities until there is a crisis situation that forces them to be surfaced. 100% accurate

You can never really be sure of your co-founders personal goals or priorities until there is a crisis situation that forces them to be surfaced. 100% accurate and I would say is probably the root of most founder breakups. It is easy to say you are "in it together" and your interests are aligned when everything is going well. But the minute something happens that has even the slightest potential to impact someone's personal goals or priorities, the spirit of being in it together can easily fly out the window. I believe that human nature makes this piece inevitable to some extent. People can naturally grow defensive when their goals or priorities are threatened. I think the bigger problem comes when that person hides that from the other founder(s). They continue to put up a front by saying that everything is ok, but their actions tell a different story.