Found something in his car

Husbnd and I were getting ready to head to work and I get in the car first thing I see on tge passenger side floor was a blue hair tie... all my hair ties are black and the type I found its not what I use. I picked it up and put it in the cup holder and didn't say anything.

Should I freak out or what ?

I'm trying to think who couldve been in the car but I cant think of no one right now. Last night he went to his friend house to pick up something and he usually hangs out for a little so I didn't think anything of it..

Idk.. I dont wanna drive myself crazy over this. what should I do?