Broken hearts are very strange.  Sometimes they catch you when you don't even realize your heart can be broken.  Sometimes they'll sneak up on you slowly and one day you realize, my heart is broken - how can I be living?  And occasionally, they'll even heal.

Usually they don't heal immediately.  Mine took months.  In fact, it took almost a year, which is a long time for someone my age.  And then one day, I saw the subject that had broken said heart, and I wondered why on earth I had wanted him.  My heart mended pretty quickly after that.