How to call things off with a partner?

[Canjo]

How do you call things off with a partner?

Do you have to sit down and have a chat?
Can you write them a letter or an email?
Text, call, ghost them?

So many variable?

how long have they been a partner? What’s the reason (not being nosy, but if they are a dick you don’t owe them much), and do you live together.

If you've been with them long enough to call them a partner then the only way to do it is face to face unless it's not safe to do so.