I hear this alot when my student are suffering. WHY?? But here's the thing, there isn't always a why. Shit happens.
When it keeps happening though, it's a pattern, and then we need to examine the What.
Like what is going on here that this keeps happening? What kind of energy is being put out there into the universe, an what kind of energy is coming back?
The type of energy you allow to you, will determine what you go through.
SO be diligent to only allow people and events and experiences around you that are positive and inspirational. Limit the time you spend with those that are not.
See what happens.