Did he/she just wake up one morning and said to you “I quit". Definitely it hurts, especially when you’ve been together for a long time. Although sometimes things happen in life that make you ask yourself questions, it is important to know that you certainly cannot understand the reason everything happens the way it does. However, one thing in life is constant and that is change.
As a matter of fact, you may have been in a wrong relationship without knowing it. In addition, it
could be that he/she left so a better person could come into your life. So instead of sitting and brooding over that failed relationship, you could dust up yourself and look forward to a positive future.
Remember, you might be focusing too much on a closed door and forget there’s an open window somewhere around you.
Princeton