She could do nothing without endangering both Destiny and Jonathan.
He was endangering her life by giving her hope and risking his emotions by remaining with her.
Then again, if Yancey was dealing with drugs, he was endangering his mother and child.
When Aurelian became emperor in 270 he quickly realized that the policy of the Palmyrene queen was endangering the unity of the empire.
Unable to sleep without knowing the truth, Toby huddled beneath the jungle leaves and stretched his senses until he found Katie. He couldn't put her in more danger, if there was something wrong with Ully. She was close enough for him to find when he needed to. If he kept some distance between him and Katie, he could figure out what was wrong with Ully without endangering her more.