<human>: Like most of the posts here, this didn't happen today. It happens every year.

I'm 20 years old. My grandpa was 78. Being an ignorant young guy, I usually don't care much to call my grandpa on his birthday (he lives alone about 40 KM from my home). If there's a party, then I'll congratulate him directly in person, but if there's no birthday party, I usually don't bother calling him to say "Happy birthday".

Around July this year, It suddenly dawned on me that he's already 78 and I never called him just to say "happy birthday" or just check on him. I don't know why this thought suddenly came across my mind. 

Fast forward to October 30 (a few days ago), everyone on my big family was anxious because no one can get a hold on my grandpa. Calls were not answered since morning. I suddenly remembered about my intention of calling him on his birthday this year. His birthday will be on November 6. Then, my mom and dad decided to go to his house on 9pm to check what's going on. I and my brother stayed home because I have a class the next day. Around 11.50 pm, my mom called me. The bad news came, my grandpa had passed away on his bed. Doctor said he's just passed away around 7-9 pm but from the signs at his home, seems like he didn't come out of his room since morning. Maybe he's hurt since morning. I don't know, I'll never know, I'll never get the chance to say "happy birthday" to him as well.

Could you distill the essence of the text into 1-3 sentences?
<bot>: Never called to say "happy birthday" to grandpa, suddenly remembered he's 78 this year and planned to call him this year, missed it by a week. He passed away a week before his birthday