Was it something I did?

Do you ever have those moments, when someone starts acting differently, and you wonder if it was something you said or did.. or if it was just something with them.  

..and then you have to decide if it was something you did, and need to approach them to clear the air, or if it would just cause confusion or make it worse.

I'm in a situation like that at the moment.  It is an icky feeling to have.  Thinking I will just hold for now.