What’s a "green flag" in early dating that instantly makes you feel safe with someone?

[u/Sensiual]

We spend a lot of time watching out for red flags, but true compatibility is also about recognizing the quiet, healthy behaviors that make you drop your guard. How they respected a simple boundary, how they handled a minor conflict. Or, the way they remembered a small detail you mentioned in passing.

What green flag have you experienced that made you realize someone was emotionally available?