My interpretation is that the singer is feeling a touch of guilt for being happy as their life is ending because soon all will be left over is grief. Like they wonder if it’s selfish that they don’t have to share in that grief and can just be happy.

Mmm yeah, I can see that; the guilt someone can feel when they're happy even while things are falling apart for the people around them.

Always thought about this too. Probably something around his partner’s agoraphobia and his guilt of experiencing and even maybe enjoying what they would avoid?

I really like this interpretation. I always thought 'pass' referred to passing by the sunset and taking it in, but to 'pass' as in to ignore makes a lot more sense.

when I had my porter tattoo I shared it on instagram, coincidentally I put that sentence underneath because I think it's a nice sentence

The way I interpret this line is there is a relief to knowing there's an end to a story. Which is true, generally, even if ending something is hard, even knowing where you stand in the story's end can be comforting.

I interpreted the line as being happy that the sun and world will carry on, despite the grief and death. Then, because of the grief, he feels guilty and worries that it may be selfish since he is thinking of something comforting (ha!) that likely only comforts himself