Whether conciously or not, many people seek & stay in relationships because of insecurities. Many people would rather stay in a realtionship they know is toxic, to avoid the fear of being alone, or the fear of whatever was built, falling apart. We come into this world alone, and we die alone. Regardless if you're a twin, triplet, etc.
Issues from childhood can generate detachment, or attachment issues, depending on how the person moves forward. When people grow up into adults, or rather in too many cases, grow into big children, this issue boils down to the individual avoiding working on themselves. While it is destructive to the psyche, in the 3D world it's more 'easy' to shove everything down & pretend you're okay.
what issues do you think keep people from having successful relationships? Whether that be an intimate relationship, a friendship, or even those situationships.. lol.