This to me sounds like a song about knowing the end is near, but making the best of it anyway.
"If this is where we had to go
Well then I'm glad we went this way"
He knows that in the end, things just won't work out. "All that's left to see is
What kind of flowers we'll become" basically implies that death is nearing, and their bodies will decay and feed the soil, and flowers will grow on their grave, basically. He seems to know he's gonna die, and maybe his lover also, but puts that in the back of his mind and focuses on the moment. Maybe his love doesn't know they're doomed, and he doesn't tell her so she can truly be happy in their last moments.
This to me sounds like a song about knowing the end is near, but making the best of it anyway. "If this is where we had to go Well then I'm glad we went this way" He knows that in the end, things just won't work out. "All that's left to see is What kind of flowers we'll become" basically implies that death is nearing, and their bodies will decay and feed the soil, and flowers will grow on their grave, basically. He seems to know he's gonna die, and maybe his lover also, but puts that in the back of his mind and focuses on the moment. Maybe his love doesn't know they're doomed, and he doesn't tell her so she can truly be happy in their last moments.
If that makes sense.