CAN'T CATCH A BREAK

" I have to mow  the lawn, take the trash out, and now you tell me I still have to make dinner for your whole family? I can't catch a break, can I?

or

He caught a break when the police officer decided not to write me a ticket.

http://www.idiomquest.com/learn/idiom/catch-a-break/

GO EASY ON SOMEONE