The Repeating Pattern
There is a behaviour in your relationship that keeps coming back despite promises to change, and you want it understood without firing an ultimatum. Give it the pattern, who, and where things stand, and this writes three versions: one calm and led by its impact on you, one honest about the toll, and one firmer. So you can say it without it tipping into a row.
There's a pattern in my relationship with {PARTNER_NAME} that keeps repeating. The behaviour is {BEHAVIOUR_PATTERN} and they've promised to work on it before, but it keeps coming back. I don't want to issue an ultimatum or make them feel attacked, but I need them to understand this is genuinely affecting me. Write three versions of how to address this: one that's calm and leads with impact on me, one that's honest about the pattern without listing evidence, and one that's firmer and makes clear this time something needs to actually change.