Ex still listens to playlist for her

I made a playlist for my then girlfriend on Spotify about 2 years ago. I tried to do something like a mixtape for her but a digital version. I forgot about that playlist already since I have a couple of lists on my account. It wasn't until I used Spotify for desktop while on a foreign trip that I remembered it actually exists.

You know how on the right side of the app it shows your friends' activity? There I saw my ex girlfriend listening to that exact playlist. I know she knows that was "our mixtape because it was obvious. Although the title was just "mixtape, the cover for that playlist was a cartoonized photo of us together. Did she do that on purpose hoping I'd see her activity? Does it mean anything?