> Personal problems can cause relationship problems, and often times a spouse can only lend support as individuals work through their personal problem.
Totally agreed with this.
In my experience (~7 years married) I didn't acknowledge I had anxiety for a really long time -- because I didn't know it. Up until the moment I actually acknowledged it I couldn't "level up" in my relationship.
On top of that, people change with time and experience (for better or worse). I feel like I am a completely different person than who I was when I first got married. Fortunately, I changed in ways that happened to be good for my relationship -- but I truly believe that some people have to level up by leaving a relationship -- even if it's not necessarily a "bad" relationship.
I.E. a relationship may begin with or without religion and if that changes for one of them it could be a breaking change for the other -- even if the people still treat each other with mutually love and respect and are hypothetically perfectly healthy with one another.