Your change in attitude and assessment of relationships is wise and healthy. However, the correct conclusion in the course of actions might surprise you - treating all connections as enemies rather than as friends means ...

> It's not too often that Sun Tzu, the brilliant Chinese military strategist and Al Pacino of “The Godfather” give the same wise business advice: Keep your friends close and your enemies closer. In other words, follow not only what your business partners are doing, but what your competitors are involved in as well. Dec 27, 2012
Keeping Your Enemies Closer - Forbes
https://www.forbes.com/sites/aileron/2012/12/27/keeping-your-enemies-closer/

> Who said, 'Keep your friends close and your enemies closer?' - Quora
https://www.quora.com/Who-said-Keep-your-friends-close-and-your-enemies-closer
Nov 4, 2014 - This has frequently been ascribed to Sun Tzu and once in a while to Niccolò Machiavelli or Petrarch, yet there are no distributed sources saying which was its origin before its utilization by "Michael Corleone" in The Godfather Part II (1974), composed by Mario Puzo and Francis Ford Coppola: "My dad taught me numerous ...

A more guarded approach than the more open attitude when you were younger is wise and recommended - don't open up so quickly or easily to new connections. Friendships and all connections must be tested - time and situation-tested ([只有遇到困难才能看到真正的友谊
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