Separation is sad.

For every action there is an opposite action.  Every meeting ends with a separation.  That is the nature of the world.  I try to understand the nature of that world.  But there are many instances where the separations faced at the end of those encounters are unbearable.  That is, when our loved ones are separated from us.  Every time my girlfriend comes to see me and says goodbye to me again is a very sad moment for me.