generally speaking, attachment is about your approach to relationships. its not whether or not you have a relationship, its how you tend to feel in relationships.

are you someone who values keeping a person around more than anything and are willing to sacrifice whatever you need to sacrifice in order to have them? (anxious)

or are you a person who tends to downplay the importance of relationships or having others around...maybe you could take em or leave em? (dismissive)

or maybe youre a person who is scared to death of having people get close because there is a fear that they will somehow engulf you/harm you? (avoidant)

or you might be a person who values relationship and companionship and expect that relationships will be mutually beneficial and end well? (secure)

it seems to me that when people are speaking of attachment around PC they're usually speaking of anxious or avoidant attachment styles and how that tends to play out in their therapy.