at the end of one’s rope

(verb) to have no patience or energy to tolerate something anymore

Example Sentences:

After living with my messy roommate for 2 years, I was at the end of my rope so I moved out.

Kerry is at the end of her rope with her boyfriend, because he is always late for their dates.

Mike was at the end of his rope with his job, so he quit.

From the Blogs:

Eclectic Interior Design Group: At The End of Your Rope

Media:

Similar idioms:

1. at the end of one’s tether