It is clear that attachments can be either 'healthy' or 'unhealthy. They are usually unanimously classified as healthy or good if they add to our wellbeing, and unhealthy or bad, if they detract from our wellbeing. This is why it's important to deal with these negative attachments and associations in any relationship.
When we carry burdens in current relationships or relationships from the past, they cost us. They take from us, rather than give. They take our spirit, our energy, our health and our ability to think clearly or realize what's happening to us. I'm certain this is the root of much stress, fatigue and illness, both chronic and acute. What destroys even the most loving relationships, is walking around with lots of wounds and experiencing the pain of unresolved conflict.
Everyone deserves a fresh start, and cutting the cords of painful negative attachments is the way to do it successfully. Effectively wiping the slate clean. We all do this at the beginning of any new relationship, don't we? Why not keep the relationship 'healthy', from both sides, by wiping the slate clean from time to time?