I think my best friend likes me?

We hang out 2-3 times a week. It’s our girl time that we get to chat/vent, drink some wine & watch our shows. We’ve been best friends for 5 years. Today while watching our show, she started rubbing my leg & then made her way to my hand. She was playing with my fingers for a half hour. I just decided to gently hold her hand. Then I froze & didn’t know what to do! My heart rate skyrocketed. She eventually let go to look at her phone.

I have no clue what happened. Should I bring it up or act like it didn’t happen?