What does it mean to be someone else's tree hole?

To be someone else's tree hole is to be someone who can help others keep secrets and vent their bad emotions. Cybertree hole means a place where you can confide in your heart, and a place where you can tell it the secret without worrying about leaking it out.

For people, having secrets will be very heavy, which will affect their health for a long time. Some secrets can't be told to others. At this time, find a tree hole to tell the secret, and people will become relaxed. Because the tree hole has no function of talking, it will never tell a secret.