Why does GOD do this?

Do u honestly want me to believe that the cause is because of this tragedy is because of unfortunate events?

Uh... yes. That's the whole point of, you know, having a brain, common sense, and an education. To give you enough logic not believe in some invisible man in the sky.

Who decides how these unfortunate events occur or who it happens to?

Nobody "decides." You are looking for an answer to the unknown and becoming afraid of it, and thus labeling it as an "act of god."

But for a persons heart to just stop, when they dont do drugs, aren't overweight and workout regularly, is a sign that someone or something is out there fucking with us.

Really, what can you NOT understand about it? His heart FAILED. Nobody MADE IT FAIL. An omnipotent being did not snap his fingers and kill your friend. I'm sure the autopsy will provide a completely logical reason for his death. Perhaps he had a rupture in his left ventricle as a child and it became a problem that one night... regardless, he was not murdered. He simply died because his heart gave out.

Plus, if you really think about it, then why do we exist then? Why do we bleed when we are pricked and why do we sweat if its hot? I know your going to say its the body's way of dealing with certain problems, but what i believe is that God makes our bodies and we are the ones that control them.

This is just crazy. God did not create your body. Your parents created your body. Your life and death are not predetermined.

To quote Vonnegut - "Vy you? Vy anybody?" It's impossible to know all the reasons behind everything. However, there IS a reason behind every occurance and it is NOT a divine influence.

I have a genetic bone disease. I don't ask myself "why did god do this me?" Most likely, chemical spraying that occured in the city when my mom was pregnant caused it. That is hardly an act of god.

To be brusque, blaming stuff on god or any other "higher power" is cowardly and shows how weak your fortitude is, as well as your ability to understand the world around you. It makes you look stupid. You need to accept that things are constantly in motion. This causes "chance" that may not always be in your favor. But that does not make it supernatural. Just unfortunate.