I noticed my former coworker liking certain photos

My spouse keeps liking photos related to a former coworker. I’ve noticed it a few times, and one evening I realized they had liked 5 or 6 photos in a row. I haven’t brought it up because I’m afraid it might turn into an argument, but it’s been bothering me. We work at different places in Ankara, and I don’t even know that woman. Do you think this is something to be concerned about?