My Fiancé keeps liking this girls photos😡

Hey ladies I recently got a message from a girl who knows me and my fiancé. She sent me a screenshot of an instagram notification saying he liked 5 of these pictures of another very attractive woman who shows plenty of her body and it was marked two hours before she sent it. I looked up this woman and the photos he liked were only the ones she showed too much skin than is typically respected. And some of the photos I saw him liked were as far back as October. Should I let this get to me and discuss it or let it be? Please help! What would you do?