My parents were getting back together.
Dad died at 50 of a heart attack, mom was devastated. Her health declined rapidly and she died at 49 three months later. I cleaned out both their homes and found calls, texts, and love letters. They wanted to be together again but didn't want to put their kids and grandkids through a reconciliation until they were confident it'd work out.
I knew she'd be devastated, they had been together almost thirty years, but they were two years divorced and casually seeing other people. They seemed to be thriving apart. So it was a shock when the grief was so strong that it took all the life out of her. She died of cancer, but the doctor also diagnosed her with Failure to Thrive brought on by the loss of my dad, and said that it may have been possible for her to live longer and even receive treatment if the Failure to Thrive hadn't taken everything she was before her cancer diagnosis.
The only thing worse than losing my dad was watching my mom live without him, so at the end of the day, I'm grateful she didn't live without him for long. She never would have had peace here again. She found her peace with him on the other side.