I don't know if there are always regrets or not. I know there are always mistakes. But it is possible that not everyone responds to them in the same way. I think some people are more adept than others at living the life they want to lead. I get the impression about Jean-Do that he was one of those people, from little things he says. It seems to me he had many reasons to celebrate a successful life. But I have no way of knowing, really, how content in his life he was, how fulfilled he felt, before his accident. Prior to it, he had made some significant changes: plans to write a novel, leaving his family for another woman. I suppose they may be quite telling. Regrets are natural, and often for the things not done, rather than for the things that have been. But also for how we have treated others. It's an interesting word he uses: remorse. When he tells us of Sylvie weeping for their shattered lives, it is arguably not just the accident that shattered them, is it? However, he is quite circumspect about certain aspects of his life really.
Ergo, the question arises: if happiness feels so ethereal, how come feelings like sorrow and despair and regret feel so permanent? As feelings go, are they not as fleeting as happiness? For some reason we tend to grab and hold onto the negative stuff and let those feelings take us over/down, and yet we easily let go of the good stuff as if it doesn't merit more than a whisper of our attention. People claim they have to 'deal with' depression, like it's a permanent state of being; but nobody says the same about happiness.
Maybe we just don't recognise happiness. Or rather we equate euphoria with happiness. I imagine that living with prolonged euphoria might be as difficult as living with depression. Perhaps we should use the word contentment instead.
I agree that they are all pretty fleeting.To me, sorrow, depression, etc have not seemed longlasting really. But there have been times in my life where it has seemed like there were more of them than the good times. I wonder about the extent to which this varies from person to person. But it is good to recognise happiness while we have it. I once spent a holiday with someone who at the end of it asked us all to identify the "champagne moments" of it. It's a custom I have maintained ever since, and not just on holiday.
"Luck... inspiration... both only really happen to you when you empty your heart of ambition, purpose, and plan; when you give yourself, completely, to the golden, fate-filled moment."