Life is a prolonged goodbye. We'd always experience losses along the journey. Losses are a necessary part of the human condition.
But a lot of times, we don't know our hearts. We often skip the necessary grieving over past losses. The "ghost" of the past gets continuously re-enacted into the present. As a result, we're not able to move on with our life.
So, I heartily recommend original pain and inner child work as a way to avoid or lessen the pain of future losses. The more you have differentiated and understood what happened to you, the better you can handle inevitable future losses and disappointments.
To do the necessary grief work to heal, you need legitimization, social support, and enough time. You need a safe place, a significant other, to the process that finishes things. It's like being born again.