Letters To Cassadee.

Alex and Cassadee were best friends since the beginning of time. When the two started dating, all they did was make their more-than-friends relationship official.
Alex couldn't stay committed to one relationship, and Cassadee refused to deal with it any longer.
When she leaves Alex with hardly a goodbye, it leaves Alex as a total mess.

He starts writing Cassadee letters with no avail.

:D