Who have I let in

I met myself, as it were, in the darkness of the morning, on the terrace by the garden, by the sea, by the clouds on the edges, as i was walking up the stairs, he passed by me like my shadow, but mirrored in every way, warm in substance, he told me in a vague, broken manner, that he cared about my health, for my health was his sickness, and my breath suffocated him. Who was I, if he was dying as I…