If you're looking at the relationship throughline, then "considering something unacceptable" would describe an aspect of the relationship. You did not indicate what story point you are exploring (e.g. Problem, Solution, Concern, etc.), which would allow a more specific answer since each is its own context to give it meaning.
For example, a Relationship Throughline Problem of Consider ("considering something unacceptable") would mean one thing, versus it being a RS Problem of Non-Acceptance, or a RS Concern of Contemplation, and so on. Plus, you may have it an attribute of the relationship ("the couple considers their current circumstances unacceptable") or something that is attribute to them ("a neighbor considers their relationship unacceptable").