Its all about depression and anxiety, something most people have on some level, and the lyrics speak to the audience in the chorus (u n me) and then speak to himself at other times, more soecifically, his depressed self since depression changes your thoughts deelings and attitude and can almost be thought of as a 2nd side of yourself.

As stated in other songs like Happy Song, depression keeps coming back, its like youre running ib circles, trying to get rid of depression is like chasing the horizon. And in this song, he thought he got over depression, and buried that side of himself (as in a respectdul parting & laying to rest of the dead, metaphorically) and i would guess the tracks are all the depressive behaviors. But, risen from the dead, you cant kill a part of you thats already dead inside. Its sepiternal, depression will always come back, every now and then we get this feeling, and a big void inside us opens up. This is sepiternal, like a carousel, running around in circles. Will we ever see the end? We're going nowhere.