How do they move on?

Saw a news on tv last night...a young couple had an accident when they went out for dinner and one of them died.(Something like that..i never understand fully the news in Italian..)

And it makes me think....how these people who lost their love one recover and move on?? Are they able to love someone else later in life without holding back like they did? It's not that you fought, you had had enough of that person and so you broke up, because you know that there'll be no future and things has came to an end, and you move on with your life. You maybe won't see your exes again, but at least you know that they are alive..living their own life somewhere..It's you who ended the relation, not something unpredictable like 'death'...and so there is no 'what if'..

But those, who lost their love one when they are still in love, how do they let it go and move on? Will there always be a ghost?

A girl who lost her bf on bus.30 when the bomb exploded in London...she never expected that the goodbye kiss she gave him before he left to work will be the last one..I wonder if she dreams at night, that he's still alive and they were married with kids..but woke up realizing that he's dead..that she won't be able to see him again..there'll be no emails, no phone calls that could reach him. Will she miss fighting with him over who's going to do the dishes? Will she cry when she found his dirty socks under the bed that he always leave all over the place? His smell on the pillows will fade,but how about memories?

Appreciate what we have now..because we never know.