This is sign to end all signs, this warning sign is so bad that marriage researchers just by spotting this warning sign can predict divorce with 94% accuracy. The end is only near if there is no intervention like marriage counseling.

The sign is CONTEMPT.

To be contemptuous is to put someone down, and to take a higher plan i.e. taking a higher moral ground. It's a position that says, "I am better, smarter, kinder/etc than you are." It can be accompanied by a belligerent attitude. When contempt is present in a relationship it is accompanied by a negative habit of mind where the wife scans the environment for her husbands mistakes rather than for what is positive or what she can appreciate. Now there is a cross-cultural universal facial expression of contempt: a lateral pull of the left lip corner to the side creating a dimple on the left side. 

Solution?

Create a CULTURE OF APPRECIATION! Be thankful! 

Key ways to do this is to communicate to your partner what you like and love about them on a regular basis. It is more meaningful when it is done unexpectedly and in small ways, but done everyday. Let them know you are thankful for: being with them, knowing them, and what they do for you. Remember marriage counseling can help you avoid divorcing and help you rebuild your marriage.