Lyric discussion by BashTheFash 

Cover art for Fall For You lyrics by Secondhand Serenade

I think it's more extreme than others have made it sound...

Their relationship was perfect, but over time became worn down, leading them to fight nonstop.

He remembers how they used to be and decides to change it. He's shedding all grudges, forgetting the disagreements, because he knows they can be so much better than that. Because a girl like that is impossible to find. A relationship like how theirs were is impossible to find, and it's worth fixing.