Rethink of that, what had we really lost? Does the lost really matter? Does the lost made your life worst?

If not, why are we torturing ourselves to recall those memories. Since the time we let go, we should let go of it completely. It's an easier task to say than doing it. Most of us just can't walk out of the memories, the past. A single small event, or a familiar songs, will let your memories flow back again. It's pity, but yet it's the truth. We think, we depressed, we regret...

Came to think of it, what's the point of doing that?? We still had our own life to live on. We still got present and future. Why don't we focus on what we had NOW. We can had even more to own than to lose. Be optimistic.

As, for the past, it was a PAST. The time we decide to let go, that's the end of it. Inevitably, we might rethink our decisions, but, that's the past and that's all. It's either we learnt a lesson from the past or we runaway from the past. 

The past is still part of our life. But, remember, it can't be change. It will stay there in the way it was. What you can change is your present and future life. Let the PAST, be the PAST.