Unfortunately I sold most of mu bitcoins when its previous record was achieved, around $1250 because I thought that would be an importan resistance level, and I confirmed it when its price dropped to $900 again, but since that correction the price has only grown every day more and more. Nowadays I have decided not to sell a single satoshi for a long time, although perhaps I have made that decision a little late. 
There is nothing wrong with it if you sell it with profit, you cannot foreseen the future so you have nothing to regret for, the basic principle must always be applied, you buy low and you sell high, if you were able to perfectly do it, you must be happy.