Debra Would Have Left Ray.
...They have have zero common interests, Ray is unable to communicate & is completely uninteresting as a person, cowers towards his mother, fails to stick up for Debra, is an absolute momma's boy - and in addition to all that: is completely inattentive, lazy, and always wanting sex. A very unappealing husband (Debra has her issues too).
I never found them convincing as a couple given Debra's strong willness. In fact, I find hard to believe that Debra would have even married Ray in the first place. There meeting & wedding flashback episodes I always found especially phony eg. Debra's happiness & professed devotion. Although, perhaps she only found out what Ray was like after she married him; after which Ray saw no need to keep being his "best".
In contrast, I found the bickering Marie & Frank convincing - as they came from a time when a woman's role and identity was largely limited to a homemaker, and a woman was expected to marry the father of her child as Marie had done after discovering she was pregnant with Robert.