This game that my opponent could have drawed but resigned

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Davidluvchess

https://www.chess.com/game/live/14091745785 

In this game my opponent didn't see that they could have drawed, and thought that I was winning, so they resigned! Here was how the game could have went:   
48. f5 Kxf5 49. Kf3 Kg5 50. Kg3 Kf5 51. Kf3 Kg5 52. Kg3 Kg5 53. Kf3 Kg5 54. Kg3 Kg5 55. Kf3 Kg5 56. Kg3 Kg5 57. Kf3 Kg5  1/2-1/2