I think that both in life and in trade, when we decide to act, we consider this the right step at that moment. It makes no sense to regret - because nothing can not be fixed. Any right or wrong decision is our life experience that will help you make the right choice in the future.
Yes, it really turns out that today, all the same, you really don't need to be sad or sad, what's the point if everything has already been done and you cant influence the situation? I think that all this is definitely temporary.