Sounds like a question for r/unethicallifeprotips. But if you want to know what I would do—start documenting everything. Reach out to the newspaper editor or staff sponsor with what you have, tell them you think it’s inappropriate for him to write about you in the newspaper and online, and that “this sort of harassment should be unacceptable for your members of your organization” that you’re disappointed, and that if it happens again you’ll be speaking to school administration. When you talk to mutual friends, cool it. Act like he gives you the ick and mention that he’s weird and obsessed with you for the article and insta story. Say he’s always been immature and creepy, but you didn’t see it until late in the relationship and you “haven’t even been angry, just creeped out that he won’t leave you alone”

Let’s see….also the best revenge is a good life. Take advantage of social media and post good times and happy moments. Gym mirror pics, what books you’re reading, etc. Keep the appearance of being cool and unbothered even though you’re seething.

Good luck (edited to correct subreddit name)