Moving on.

A song once said 'I believe that the heart does go on'. Is it true? Honestly, I hoped it was, but each day it turns out to be false for me. 
Undoubtedly in the very long term, everything moves on, everything is forgotten and taken for granted, or deliberately ignored. 
However, no one is willing to get rid of a burden in a 30 years interval. Everyone rather prefers to free themselves from sorrow in a short period of time, both so they do not suffer and they can begin their new project as soon as possible wasting little time in regrets.
It is very tough, to remind yourself every day to forget, to constantly think about how to eliminate your appreciation for that which is loved and no longer available. 
Sometimes a solution may be clear and easy to implement, perhaps harsh to solve due to internal pride, or regrets, or vengeance, or whatever the reason might be. Nonetheless there are times when no solution exists, when the only thing you desire is a past state that made you happy, a state that is no longer plausible or even bearable, and all you can do is reminisce old times when happiness was, but now it is no more. Joy may arrive again in any other form, and we all know that. There is no definition for whatever makes you happy, simply because it changes over time, and all you need to do is move on, let go the paradise that can no longer be and open your doors to whatever new surprise fate will put in your path. 
It is easier said than done of course, theory always seems easy and quick, but practice might take more time and way more effort. The quest we encounter when happiness dies and it is beyond repair is, how do I let it go and move on? How do I kill a part of me stuck in the past, and take a step forward into the void, with absolutely no certainty of what the outcome will be?
No one knows how.
Time knows.
Just wait, and when the time is right you will be able to walk alone again towards new horizons. For some it is days, weeks, and others might need months or even years. The scars of the heart heal at a different rate, but there is something we can do. Most of the times, long healing periods mean that the wound are opened and unable to close because whatever causes them has not stopped. Firstly, the hurting agent has to disappear, so then the regeneration process can start, and this is necessary.
Perhaps we cannot get rid of it, maybe we still love the hurter, it can happen that we love the pain and we don't know it, or we could be too weak to let go.
Either way, something is to be done. To ache until magically all the pain vanishes is not an option, because the effects will definitely be noticeable and negative for ourselves. The quicker we abandon sorrow and adopt an uncertain future, the sooner we will heal and give better uses to our lives. 
I do not know how to make this process easier, all the pain we have to experience is determined from the beginning, and until we don't suffer it all we will not feel relief. Yet I do know, sadly because of experience, that even with all our energies focused on letting go and forgetting our impossible desires, we are stubborn and it can be as hard as making a child stop crying by taking away more of their toys. Eventually the baby will stop crying, but he could have avoided all the pain he suffered in the meanwhile.

All in all, it is our choice. The first step has to be taken by us. We will not move on if we do not want to in the first place. Find whether you really desire to abandon your lost paradise, because maybe it is possible you can recover it, or thoroughly meditate on what will be the consequences of letting go and starting a new adventure. 
Here's one advice from a boy who has suffered a lot: good times always appear again, and they will go away, but moving on will let us read the whole book, and sticking ourselves in a painful page will not do any good.

The end, now forget your painful torturers and move on.