The people who trust you most rarely announce it. They just stop explaining themselves around you.

Trust often shows up as an absence. People who are unsure of you narrate constantly, accounting for where they were and why they said what they said, because they are managing your possible reaction. When the narration stops, they have concluded that you will assume the best. It is easy to miss, since nothing visible gets added.

Notice who has gone quiet in that particular way around you and take it as a compliment. Protect it by not reacting sharply when they tell you something plainly. Notice too where you are still explaining yourself, because that says something as well.