When

Would you believe that some people have go to therapy to learn this? Well, there you go...we just saved you a bunch of money. Use it for something that will make you happy!

Seriously, these are the definite signs that you are "over" a situation, person, etc. It's called 'detachment', and it happens naturally, with time. 

By being aware of it, you may help the process along, or at least live through it a little easier. 

Whatever or whoever you have strong emotional reactions to,
still has control over you.

Think about it.