It's tempting to analyze our partner's behavior in an effort to better understand them, even to the point of hanging the label of some mental health diagnosis around their neck.
While I can even imagine cases where this might have some validity, the inherent risk in this choice is that it's a distraction from our own behavior. When we over-focus on their contribution or influence on the relationship, we may be overlooking our part and put all our eggs in the one basket named "If they'd change our relationship would be so much better".
In this we risk giving up our primary source of power and influence and increase our dependency "the other".
Don't forget to shine the light of analysis on yourself, your contribution and what you can do to change and grow in your relationship.