How long will this go on?

So it’s been 4 years since I made my last post, and unfortunately I like the same person again. I’ve known this guy for while now, actually since I was eight, but we’ve only started talking when we were 12, eventually we got closer when we were 12 and I developed a crush on him. When we were kids we were “enemies” , I would talk about how much I hated him and how weird he was. But many people realised that I talked about him so much that it seemed obvious that I liked him. We went to different schools after 12, at first when we were adjusting to our new schools, we would text all the time, he was the guy I could text whenever something happened. I’m not super close or outgoing to people when I first get to know them, it takes me a while to get to know people. So you could say he was my “comfort person” that knew me and got my humour. Well, as years passed, we gradually stopped talking frequently. I mean we did go to different schools, for the longest time I knew my feelings for him were not fully gone though I liked a few people after him. At 13 to14 I would try to reconnect with him because I felt like there was still something there and that I could see my future with him. At 15 I eventually stopped trying, I thought my feelings were him had disappeared. Well now at 16, I like him again. What happened? I really thought that distance was the closure I received to get over this chapter. But what can I say we live in the same neighbourhood. There was once I was eating lunch with a friend and I coincidentally looked up at him and he coincidentally looked down at me as he was going to sit at the table across me, our eyes met and I couldn’t stop thinking about it since then, because right after he saw me, he left. After that, I started having lessons with him again, I joined the lessons because I was really sure that I did not have feelings for him anymore. After that incident, it got harder for me to stop thinking about him since I started having lessons with him again. I really don’t know how I got myself into this situation, for the SAME guy, after all these years.