The close friend (22F) sent my boyfriend (25M) inappropriate photos of herself. What should I do?

I' ve discovered a pattern with one of my ' friends' in my group. She got with my ex. Yet this was after we broke up. But I am with the current boyfriend now whom I love, and this ' friend' kept saying what sweet babies we would have together. But yesterday my boyfriend showed me on instagram that she dm' male impotence him with thirst barriers of herself. They were clearly showing her boobs, posing and in weird positions. Since she requested to follow him on Instagram, I' ve noticed she has been constantly posting raunchy pictures associated with herself on her story, which she never used to do before. What is she doing? Is she trying to get with my partner now? Should I confront the girl straight up about it?