I base my opinion on this phrase mostly "There are days when outside your window, I see my reflection as I slowly pass And I long for this mirrored perspective, When we'll be lovers, lovers at last."
I think this song is from him to him. About getting to know yourself, being okay with yourself and finally loving yourself so that in the long run you are okay being with just you. Noone's gonna love you the way you love yourself. Maybe "You gotta love yourself first before anyone else can."