Three may keep a secret if two of them are dead meaning?

The phrase "Three may keep a secret if two of them are dead" suggests that secrets are difficult to maintain among living individuals, as people are likely to share or leak information. The implication is that if only one person remains alive, the secret is safe with them, since they are the only one who knows it. Essentially, it underscores the idea that trust is fragile and that the only way to guarantee a secret remains unshared is through the complete elimination of those who know it.