The phrase "conflict spouse" refers to a person who is married or in a long-term relationship and frequently disagrees or argues with their partner. It implies that there is a lot of conflict or disagreement between the couple. Full definition
This approach can be an excellent alternative for high conflict spouses who are looking for assistance in reducing the conflict and keeping their separation away from court and costly litigation. (mannlawyers.com)
If you have a high conflict spouse chances are, you know it! (karencovy.com)