I am obsessed with a guy who dont want a relationship, he wants to hookup, I tried to stop talking but I feel he would replace me so I go back again?

Whenever I like a guy I have the behavior of ignoring every red flag and putting him on a high pedestal. So I did the same again. This guy don't want a relationship he just wants to hookup with me. Whenever I try to leave I feel this very bad insecurity that he will start talking to someone else so I find myself staying. And I'm very obsessed with him. How can I get myself under control and tell myself that I should leave him without worrying whom he's gonna talk to or whatever. I have this worry that I won't have anyone if I leave him because I feel his presence in my life is like the only positive thing in my life. I wanna change this and leave him because he's not good for me. Can someone please advise me on this

I am obsessed with a guy who dont want a relationship, he wants to hookup, I tried to stop talking but I feel he would replace me so I go back again?
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