As I can see with your result, losing are still inevitable despite of using this strategy that proves that Martingale is not worth it in the long run and this is also why I decided not to use this and only bet within my limit.
Any known strategy, when you don't know when to stop, you will end up losing.
Martingale or any other strategy, will only work for quite some time.
If you will continue playing even after winnings, the house will definitely catch up until you lose your winnings again.
But those strategies work, only to certain degree. Not all the time. You should know how to manage the winnings if you got to such point.