There is no way to get over death. There is no way to fill that void once it has been carved into your heart. Instead, you learn to make that void into an inspiration.
Just want to let you know that I can totally relate. My closest friend (who was also my cousin) died at when he was only 14 of a rare, genitic heart disease. So if you ever need someone to talk to, I'm totally here fo you. Keep strong and I'm sorry about the pain that you are going through. Remember that day will shine once you let the tears polish them!
