Try this
- Draft three short parts: what happened, what you appreciated, and a simple closing.
- Read it aloud and remove any sentence that sounds borrowed or makes a promise you cannot support.
A worked example
“You brought soup when my day was full. Not having to think about dinner helped. Thank you for that.”
An invented example to adapt, not a real exchange or a script you have to follow.
Before you leave it here
The note does not need to summarize the whole relationship. Keep it proportionate to the gesture and send it only if you want to.