"Our relationship is stale."
It's very easy to make a statement like that.
Face it, who hasn't felt like their relationship has been more like week-old rye than a freshly baked baguette?
A relationship with a human, especially one you are close to, is neutral. It's not good or bad, and it's not fresh or stale.
A relationship with a human is made up of your thinking about that human. Nothing else.
The emotion - the freshness or the staleness comes from the way you think about that relationship.
The thought you have creates emotion. then the emotion occurs in your body as a feeling sensation. That feeling then directs your behaviour towards that person, affecting how you show up, act or behave. It affects what you do and don't do.
This combination of thought, emotion and behaviour creates the energetics of your relationship, the atmosphere of your relationship if you like.
Your thoughts, feeling and behaviours give you the result, the experience of your...