I was wondering whether either one of the sentences below:
a. I'm done with you.
b. I'm through with you.
can be used in AmE to imply: "our relationship is over" for the speaker. If no, then I wonder how they differ semantically?
Be done with somebody (especially BrE):
No longer be involved with somebody:
Example: I’m fed up with you lot! I’m done with you for ever!
Be through with someone:
To have ended a relationship:
Example: I’ve told Larry I’m through with him, but he keeps bothering me.
I have read the similar thread What is the difference between “I am done” and “I am through”?, but while it was it was not helpful at all, though I think the poster's question was absolutely clear.