Significant Over 

A non-gender specific reference to to an ex-lover who was not a spouse.

"Yeah, Taylor was my significant other about five years ago, but now he's my significant over."

Significant Over by Meladiction November 15, 2012

Significant Overlord

When your significant other is a relentless taskmaster who gives you zero privacy, and doesn't trust you at all.

An old (girl) friend posted a joke on my Insta, but I had to delete it so my significant overlord wouldn't see it, and hassle me about it later.

Significant Overlord by Nylon Nylan June 4, 2021