In marriage, communication is very vital. By trying to understand what's going on with one's spouse try to understand her/his situation. Talk and talk heart to heart, calmly without anger, would solve the problem better.

I think if she/he able to say that probably they were depressed/frustated with something, may be they did not get a good respond, or they could not express their feelings well. This treat is sign of last resort they could use to get attention.

Try to understand them, with love and understanding and patient, there must be something bothering them.

Good luck, May Allah bless them with a good marriage.