I am wondering what "the mistrustful way he acts around Will" means in the following sentences:
I watch Charlie until his gaze snags on mine – I make sure I’m the first to glance away. And I wonder: is he now the jealous one? I’ve seen the mistrustful way he acts around Will, as though he’s trying to find the flaw. I caught him observing the two of us over drinks. And I felt it again, how good we look together, imagining it through his eyes.
- Lucy Foley, The Guest List, Chapter 14
This is a thriller novel published in 2020 in the United Kingdom. One hundred and fifty guests would be gathering at some remote and deserted fictional islet called Inis an Amplóra off the coast of the island of Ireland to celebrate the wedding between Jules (a self-made woman running an online magazine called The Download) and Will (a celebrity appearing in a TV show program called Survive the Night). The day before the actual wedding day, during the rehearsal dinner, Jules sees Charlie. Jules once had a crush on Charlie when she was sixteen, and was secretly envious of Hannah for having married to Charlie, who once worked as a sailing instructor and is now working as a geography teacher for fifteen-year-old students. And she presently wonders whether Charlie is the jealous one now, because Jules is going to be married to Will. (The narrator here is Jules.)
In this part, I wonder what "the mistrustful way he acts around Will" means.
Would that mean Charlie's behaviour itself was mistrustful, like his behaviour contained many suspicious aspects?
Or, would that mean Charlie's behaviour towards Will revealed his mistrust towards Will, like Charlie does not believe Will is a good person...?