He Who Burns Bridges - S1.E4

Peter accepts a job with another company where his advancement won't be hindered by being a bachelor. He writes a scathing letter to Mr. Brahms exposing the entire setup with Greta. He then goes home and tells Greta their occasional marriage is over. Peter finds out the next day that the man who hired him has been let go, so he's not hired. Peter goes through the mail in Mr. Brahms' office but doesn't have time to get his letter back so he ends up hiring a shady character to break into the office with him and retrieve it. He then has to renegotiate the terms of Greta's employment before she'll agree to continue their ""marriage"".