600 consecutive loses in x10 is madness... it's like loosing 6 consecutive times on a chance of 99.9% to win. Was you friend playing with random high and low?
I would recommend to play always high or always low.
I would show this whole losing streak, but freebitco.in only keeps a 10-day history of rolls. Why do you think they don't store the entire history of rolls, like stake.com does?