What did Gu Yanwen say? Who else can you trust if you can't trust me?

In ancient literature, this sentence might have been called " Who else can I trust if you can't trust me?" or " Who else can I trust if you don't trust me?" This kind of expression often appeared in Wuxia novels or detective novels. It meant that when the protagonist faced an enemy or someone he didn't trust, he would think about who else he could trust to strengthen the protagonist's ability to resist attacks.