I think the songs about him and someone who he loves and has been with had a falling out. This person is important to him because they have known each other since childhood which explains the lyrics "Underneath were all these pennies fallen from the hands of children
They were there and then were gone" He wants to apologize but he finds out that in the morning she is leaving he does not want her to leave due to the fact that he can't move on which is why in the song he talks about the sun harshly with the lyrics "In the morning waking up to terrible sunlight
All diffuse like skin abuse the sun is half its size
When you talk you hardly even look in my eyes
In the morning, in the morning". The girl however wants to leave to move on from their relationship and in the morning takes some things for memories and leaves ( which explains the lyrics "In the doorway holding every letter that I wrote
In the driveway pulling away putting on your coat
In the ocean washing off my name from your throat
In the morning, in the morning" The man knows she leaves which leaves him feeling defeated which is told in the last few lyrics of the song "And if I just stay awhile here staring at the sea
And the waves break ever closer, ever near to me
I will lay down in the sand and let the ocean leave
Carry me to Innisfree like pollen on the breeze." At least that's what i got from it.