Office Spouse 

A person at the office that one shares all the trials and tribulations of the job and outside personal life with--also rumors, gossip, etc.-- on an emotional level. The first one someone runs to when something big happens in thier personal life or at the firm. An emotional relationship, but not a physical, sexual one. Relationship is confined to the workplace--if it goes beyond that, it is more than an office spouse.

It must have been something big, because after the meeting she went straight to Malcom, her office spouse.

Office Spouse by Dr. Foo March 23, 2010

Office spous 

A person of the opposite sex that you hang out with a lot during working hours. They get jealous when you talk to others of the opposite sex, spend way too much time goofing off with you, etc., but there's no physical component to the relationship.
It is also called 'Office husband'.

Coworker: Dude, are you hooking up with Philip from accounting?
Other coworker: I wish, but he's already married. He's just my office spous.

Office spous by Yong Hwan Kim October 30, 2008