25F - I’m feeling like I can’t sleep because I keep thinking about my ex

My ex won’t leave my mind. We broke up years ago but it was my first relationship ever. I’m not sad that we broke up, I’m relieved but I’m wondering if it was ever real. So many thoughts in my head. It would great if I could just talk about it with someone. I promise I’m not usually like this, but I kept tossing and turning and it’s not leaving.