You can gauge the depth of a relationship in many ways.
One powerful way, in particular, is by how often you apologize to each other.
Personally, I’m very confident that in my interactions with others I fall short frequently.
This does not mean I’m always aware of when I do, I’m not blind to the fact that I sometimes am either too blind to notice or just choose not to apologize for fear of discomfort.
However, today I apologized multiple times to those around me, and not only did I feel better having asked for forgiveness, I believe the relationship is strong and better for it.