Name the impact without exaggerating it
Describe who had to wait, worry, redo work, spend money, or make a choice with incomplete information. For a message about how to set an intimacy boundary with your partner, use this factual base: name the current pattern, concrete impact, and decision that needs both partners' attention.
Make repair practical
Offer the repair you can actually complete, with ownership, timing, and any limit stated honestly. Ask for a time and format to discuss one issue, then identify any outside support that could help. Make the immediate next step clear enough that the recipient can answer without reconstructing the entire history.
Let future behavior carry the proof
Do not threaten abandonment, use intimacy as leverage, or demand an answer during an unsafe or heated moment. Use specialist domestic abuse or emergency support when coercion, violence, stalking, or immediate danger is present. A promise inside a message is weaker than a visible change in what you do after it.