Well, that's that then. I turned the key for the last time, and turned away from the door. Down the short path, past the railing. Crossed the little half-step into the street, as I had done a thousand times before.
I don't know whether it was because I was still looking back at the house, or he was immersed in his phone, or both. But somehow we collided and he went tumbling to the damp pavement. I went to help him up but he was already rising and we bumped again in a cloud of mutual apology and embarrassment.
He stooped for the phone.
"Sorry, I just need to send this. Right, that's done. Done. All done" A note of finality in his voice. Brushed himself off and smiled at me - a little longer than necessary. Then he was away, and I watched his heels disappear around the corner.