Netflix (NASDAQ:NFLX) has taken investors for a ride over the last year and a half, but those individuals who maintained their resolve, and held onto Netflix through the ups and downs, did incredibly well. 

However, continuing to hold shares of Netflix as it soared to new highs, and crashed down to earth, was easier said then done. In the video below, Jeremy explains why investors should never sell a stock purely because of share price movement, and reveals one simple truth that could save your portfolio.