The sadness we feel when we go through loss or separation is not coming from the loss itself, it’s coming from the irrational mind of attachment. Buddha gives scientific teachings on how our pain is created by this and other negative states of mind. Based on Understanding The Mind by Geshe Kelsang Gyatso, Gen Gomlam explains that by understanding the distinction between love and attachment and realising how Buddhist wisdom overcomes this irrational and painful mind, we can heal our emotional pain. Further reading in the following book: How to Understand the Mind