A Breakup...
A relationship breakup (or otherwise simply known as a breakup) refers to the ending of a relationship, typically a romantic one. A breakup can vary from casual to emotionally traumatic.
Breakups can occur for innumerable reasons, including conflicts in personality, lifestyle changes, breaches in spoken or unspoken codes of conduct, or attraction to a different person. A breakup that is decided upon by only one person is commonly referred to as dumping.
So this is the definition of a breakup!! Enough said...