Thank you, transient! I would like to have your resource on gaslighting.

There was a new development in this situation --- I confronted him again when he got home and he again insisted that I was just making stuff up... then we figured out that the friction burn on his back actually came from the mesh on his new office chair. He had been leaning back in it shirtless... so I really was accusing him of something that didn't happen!!

It was very embarrassing and a good reminder to me that I am not always right. I am just thankful that I did not ask the neighbors if they knew anything about it!