The past is made to remember and to learn from. As choices he made were in times he felt them right. Without putting them in the frontline of his present.
The present is now and has to be seen and felt as such. It will never occur again because of its uniqueness. The choices he makes now are giving a certain direction to the future: part of it is under his control but most of it is not.
The future starts in his head and imagination. It is the result of his expectations and calculations based on what he knows. It deserves a place and gives importance and guidance to his present.
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But what will be, will be.
What is now, is happening, and deserves all of his attention.
How things went, he should leave them behind.