I am trying to understand the bounds of what is or is not polyamory, which I understand to be a form of ENM.

If a person withdraws (e.g. sexually) from or leaves a relationship due to that relationship opening from a closed one, is that considered fine within polyamory?

If they have the same reaction due to another person either getting an extra partner or one that they disapprove of, is that fine within polyamory?

Edit: Removing “ethical”