He's been working so hard in his relationship (tired from the day on the track)
and now he's starting to give up, because he realized that he'll never be anything she's dreamed of (middle distance runner)
He put everything into the relationship with the next verse, and realizes that it isn't going to work out, and there isn't exactly a future between them.
He still loves her though. even if she says she wants to come back to him, later on after they've grown apart (woman you've become), he knows it wont work out because he's a middle distance runner still. but he'll love her anyways, and he knows it won't ever work.
He's been working so hard in his relationship (tired from the day on the track) and now he's starting to give up, because he realized that he'll never be anything she's dreamed of (middle distance runner)
He put everything into the relationship with the next verse, and realizes that it isn't going to work out, and there isn't exactly a future between them.
He still loves her though. even if she says she wants to come back to him, later on after they've grown apart (woman you've become), he knows it wont work out because he's a middle distance runner still. but he'll love her anyways, and he knows it won't ever work.