From Fallen London Wiki
This page contains details about Fallen London Actions.
You may need help for this. He may be resistant to the idea.
Game Instructions: This will end your relationship and you will lose your Spouse. You will not be able to woo them again.
A bitter parting
You need a lawyer's help, but eventually you manage to get the jewel thief officially evicted from your lodgings. For weeks afterwards, you'll be working out what he stole from you before he left.