Observation
What happened that another person could verify? Avoid labels such as careless, selfish or impossible.
Impact
What practical or emotional effect did the behaviour have? Keep the description proportionate.
Need
What value or need matters here—clarity, respect, reliability, space, reassurance or fairness?
Request
What specific behaviour are you asking for next? Make it clear enough to answer yes, no or propose an alternative.
Boundary
What action will you take if the pattern continues? Choose something you control and can realistically follow.