How do I(21F) move past my boyfriend’s(23M) ex(23F) constantly posting about their past relationship?

I (21F) have been dating my boyfriend (23M) for a year now, and we’ve been living together almost the entire time. We’ve known each other for two years before that because we worked together. Here’s the issue: my boyfriend’s ex, who he used to live with, has been harassing me since before my boyfriend and I started dating. At that time, I had a boyfriend, and she would send me awful messages on Instagram, calling me a “whore” and other vile things. It was pretty draining.

I noticed that she views my TikToks from her sister’s account and I can’t seem to stop checking her page in return, which I know isn’t healthy, but I can’t help it. Over the past couple of months, she’s been reposting things about an abortion she had with my boyfriend, claiming she regrets it. On top of that, she’s also been reposting about him—even though she has a boyfriend now. I know my boyfriend doesn’t care about her and actually dislikes her, but it still bothers me seeing these posts.

It’s messing with my peace of mind, and I don’t know how to stop letting her actions get to me. I want to move past this, but it feels hard when she’s still so present in my thoughts and on my social media feed. Has anyone dealt with a similar situation? How do I get over this and stop letting her affect my relationship and my mental health?