In this song a girl's (Cathy) dream was to live happily ever after with he boyfriend(Jamie) , but all Jamie wanted to do was peruse his dream. Sadly, his dream did not involve Cathy.
"Jamie is gone
Jamie's decided it's time to move on
Jamie has new dreams he's building upon
And I'm still hurting(...)Jamie's convinced that the problems are mine
Jamie is probably feeling just fine
And I'm still hurting"
This also shows my theme that "not all dreams come true" because all Cathy wanted to do was to marry this guy and live happily with him. But Jamie lied and believes it's all her fault. Her dream was to be with him, but that won't happen.