What it takes to unlock deeper relationships

Relationships usually start with affinity: we work together, we live near each other, we both enjoy the same hobby or we exercise at the same gym. They deepen as we validate one another (implicitly or explicitly): we appreciate each other, we listen to each other, we show acts of kindness or we inflate each other's egos. The deepest personal and professional relationships, though, reach a third level: true acceptance.
Well, you say, I've had long-term productive relationships that operate quite well at the first two levels of relationship depth! And it's true that commitment can occur at any of these three levels. Connection, however, gets stronger as relationships go deeper.