Imo, If it makes you feel better do it. Consider writing the letter and not mailing it tho. While every situation is different, her response probably won't satisfy you and likely will only make you feel worse.

Ewww. That's so toxic. You deserve better.

No worries, just needed to know if I needed to have something else to hand him day of. Thank you!

Hey I bought some dice last Friday as a bday present for my partner and I emailed asking about lead times to see if it would be there in time but haven't heard back.

Or those death bed reconciliation scenes. Like who are those for exactly.

Okay well just in case you're amazing and a constant source of inspiration to those around you.