I need boy help pleaseeeee

There’s this guy I’ve liked for the longest time. Him and I have talked on and off but he told me he’s not looking for anything a couple months ago. Idk if he is just saying that because he’s not interested in me or what. He has said in the past that he’s attracted to me and wanted to hook up with me. (We didn’t end up doing that) we have both had feels for each other on and off since we were young. Have never actually been with one another but knew each other liked one another… anyway. I found out he has been hanging with a girl (it’s a new thing). I felt hurt to hear that. I have tried to get over this guy for years but any time I try to get over him I can’t and I have gotten to a place at points where I found another guy but when I talk to them I constantly think about this boy that I have such strong feelings for. A guy can be the most perfect man out there and for some stupid reason this guy gets in my head and I can’t move forward with any guy that I talk to. I feel stuck and don’t know what to do. I feel like if I can’t move on that I’ll be alone forever unless some how magically one day him and i end up together but I’m losing hope. I always feel like we’re in different places in life.