I never regret on selling my bitcoins as whatever bitcoins I gave that are earned and not invested so whenever I m satisfied with the price I sell my bitcoins as I know that I can earn it back.
I also do not feel sorry for selling not selling origin I also see the price developments and if I think the price is suitable or profitable I will sell it although it is likely to rise again the price, because I need a fee for daily needs and that's the reason I'm in bitcoin . so I will not hold back a long time if the price is right I will sell it and I do not feel sorry.