Which song of Taylor Swift with lyrical content finds Swift falling in love again after a failed relationship was not re issued? 
State of Grace (Taylor Swift song):  It was the only promotional single from the album that was not re-issued as an official single, as "Begin Again", "Red", and "I Knew You Were Trouble", were all later re-issued as official singles. Begin Again (Taylor Swift song):  "Begin Again" is a country song, with the lyrical content finds Swift falling in love again after a failed relationship.
Begin Again