The expression AT THE END OF ONE’S ROPE means in a state in which you are not able to deal with a problem, difficult situation, etc., any longer:
I can’t stand your behavior anymore. I’m at the end of my rope.
She was at the end of her rope. This is why she acted so strangely.
I’m not going any further, I’m at the end of my rope.
Judging by how slowly you’re acting, I can see you’re at the end of your rope.
I know you’re at the end of your rope, but we’re very close now, so don’t give up!
Here’s the video version of the article: