It's hard to let go of the ones you care the most about. It's not because you expect them to never go, because that would just be foolish. People pass away, they move far away for a better opportunity, sometimes, things just change, and you both move on. But, in someway, everyone will eventually need to let go of the one's they love most.
Truth is, the hardest part is that, it's not until they've gone away that you can truly see the whole picture of what they mean to you. The one downside to being truly close to someone, is how narrow the view is. It's like taking a picture zoomed all the way in. The shot may be phenomenal, but you still miss so much of what's around your subject.
When your nearest and dearest go away, you start to see the things you never realized before... The lessons that they've taught you... The times you thought about them and didn't even realize it... The way just sitting side by side, not speaking a word, impacted you. You see it now, when that chair beside you is empty.
- From "Dune", by Frank Herbert