Start with the part that is verifiable
Separate the event you can describe from the motive or reaction you are guessing. For a message about how to resolve ownership of a car with an ex, use this factual base: list the item, account, lease, pet, vehicle, date, or legal document that still connects you.
Make one answerable request
Give the recipient one concrete question or next step instead of several emotional jobs at once. Offer limited options, a neutral exchange method, and a date for closing the practical issue. Make the immediate next step clear enough that the recipient can answer without reconstructing the entire history.
Leave the recipient in control
Do not attach relationship arguments to a logistics message or arrive uninvited. Use a third party, public exchange, legal channel, or specialist support when direct contact is unsafe or restricted. A clear message remains useful even when the answer is no or no answer arrives.