Zapficmonday||Sad Story||When you miss someone a lot, you can die

Thanks to @Zapfic.club, Hive account@freewritehouse and all friends. Today, I have written a very sad story whose secret is still unrevealed. Can you help me in finding this secret?
It was a dark night, she was missing all the good and bad memories that she had spent with her BF. There was a stream of chitchat and fight. She was feeling everything with her BF. One event that caused heart-attack. It was a hidden-secret.

Image Source (Pixabay, No name)