I don't know what this is

I saw him on the train, when he sat next to me. I didn't like the look of him. Was he drunk?
He sat near me. I continued reading. When we got off the train at the same stop, I couldn't help but think he was following me.
I stuck with the crowd, relatively large for this time of night. Slowly members dropped off.
I kept an eye on him, watching as he crossed the street. I must remember to be aware of all my surroundings, not just focus on him.
I fell in line behind a woman. I felt safe with her.
She stopped to adjust her shoe. That's my move. I use it to check out who's following me.
I felt like waiting for her, but knew that would be wrong. So I kept walking.
Once in a while, a glance across the street until he was gone.
But there were others.
I counted down the blocks as I reached them and the number of deserted streets I had to cross.
Relief as I walked through the iron gate.
Dread as I turned my back to unlock the door.
A final deep breath as I re-locked it behind me.
Home.
Safe.