Whatever is intended for you, will come your way and whatever is not intended for you, will not come your way. If you sit there wondering, how come such and such has not happened? Maybe it did not happen because if it did happen, it would destroy you, cause you some type of pain or it is something that is not decreed for you.
Then you might think, will how come it happened to such it such? Maybe it was a time appointed for that person and Allah had given it to them or maybe what they have is a test itself and what you don’t have is a test itself.
Everything has a reason behind it. Either to save you from some harm or a test on you with what you might do with what was granted to you or in return, Allah has something better for you. So be patient and be thankful.