heartbreak

A broken heart (also known as heartbreak or heartache) is a metaphor for the intense emotional stress or pain one feels at experiencing great loss or deep longing. The concept is cross-cultural, often cited with reference to unreciprocated or lost love.
Failed romantic love or unrequited love can be extremely painful; people with a broken heart may succumb to depression, anxiety and, in more extreme cases, post-traumatic stress disorder.

View More On Wikipedia.org