(noun) Very sincere and difficult emotional problems or stress
"To ease another’s heartache is to forget one’s own."
"You can obsess and obsess over how things ended—what you did wrong or could have done differently—but there's not much of a point. It's not like it'll change anything. So really, why worry?"
"Expectation is the root of all heartache."
"This is a good sign, having a broken heart. It means we have tried for something."