At the funeral director’s where I work, I hear my boss talking to the just bereaved family when they first ring up - so often as they apologise for crying on the phone he tells them not to worry, they need to cry, more importantly he tells them honestly that life will never be the same again. ( It is a small town and he knows virtually all his clients). Initially for those who lose a loved one there are the funeral arrangements to concentrate on, then for some reason the first year and/or Christmas becomes the goal, but the fact is life will never be the same, the bereaved will never be forgotten, even by those who go on to remarry, there will be sadness but in time most people learn to live with it.
The reality is that there are a lot of lonely people (Lennon-McCartney) but that does not make it easier. You can fill your life with social activities, have a pet, pamper and treat yourself occasionally, but the empty hole will be there.
The worst thing to do is live with anger. The loved one did not choose to die and leave us, (unlike in a divorce) and our sadness would sadden them if they are/were aware of it. We all know from a young age that life is not immortal, that death can come at any time, out of the blue or foreseen, in one form or another, by accident or disease, instant or lingering. The best we can do is live in the now, appreciate the loved ones who remain and be grateful for the time shared with the ones we lost. Easier said than done, but it also helps to look at others worse off than ourselves and, if possible, become actively involved in an organisation that helps them.
All cliches I know, but tried and tested.