Sometimes, the only reason why you won't let go of what's making you sad is because it was the only thing that made you happy....

@PeachyK I think it's personal and balance varies from person to person. Life is an emotional rollercoaster.

@PeachyK I think the 'sadness' that @sutten is writing about is more unresolved grief than the sadness a person feels about a lost opportunity. Sometimes the grieving process (it is a process) takes a long time and sometimes 'somebody' or 'something' happens that interrupts or diminishes the significance of that grief, e.g., it might be something as simple as someone saying, "You will always miss him/her, but it's time for you to let go." - When in reality, you need more time. Grief counselling can help when you just can't 'let it go.'

@JollyRoger Correct :)