Most cofounder breakups trace back to a conversation that never happened. Splits, expectations, and exit terms get left vague because the early days are all optimism.
Vagueness is comfortable right up until it is catastrophic. When something goes wrong, the absence of an agreement becomes the fight.
The fix is unglamorous: have the awkward conversation while everyone still likes each other.
What to Write Down
Equity split, vesting, decision rights, and what happens if someone leaves. Put it in writing.
A document made in good times is the cheapest insurance a founding team can buy.