Help pls

I’ll try to keep this short. My first love broke up with me in October 2024 because he said he had lost feelings for me. We had been together for about a year. A week after the breakup he met his current girlfriend. However, for about a month after we broke up he kept changing his mind sometimes he wanted to get back together, sometimes he didn’t. Later he changed his mind completely, removed me from everything, and about one or two months after our breakup he was already with that girl. I don’t know exactly when they officially started dating. A few months later, during the summer, he watched my Instagram story. About a month later he watched my friend’s story. Now I feel like I’ve mostly moved on and it doesn’t affect me that much anymore. But a few months later, about two weeks ago, he watched my story where I posted a selfie. I didn’t expect that at all.He watched that story twice. Two days later he blocked me, unblocked me, blocked me again, and then unblocked me again. A week later I posted a story in the morning from a birthday party, and later that evening I posted another story from the same party because my friends tagged me. He watched both of them very quickly. A few days later I posted another story of myself. First he viewed the story from a fake account ,I’m convinced it’s a fake account because I saw that his email and phone number are connected to it. Then he watched it twice from his main account as well, because his name appeared at the top of the viewer list. Another strange thing is that he blocked my friend, my sister, and two of my other friends — but I am still not blocked. Why did he suddenly start stalking and watching me like this? We don’t even follow each other anymore, so he has to actively search for my profile to see my stories. And he still has a girlfriend, which makes it even stranger to me.