Heartbreak occurs when you experience something that causes you sadness and emotional distress. When your first pet dies you are heartbroken at the loss, and when a family member passes your heartbreak may be devastating. Betrayal by someone that you care about can cause you to feel this distress. Just remember that time will heal a broken heart and you will move forward as a better person.
The most heart breaking thing in the world is to be in relationship with someone and you feel alone.