Should I move on?

There’s this guy I really like and I’ve told it to him plenty of times. He goes through phases of acting like he’s interested and then he’s not. I’m tired of feeling like I’m pathetic over him and just chasing him. When I’ve asked him if he sees a future with me if I back off, he says “he doesn’t know” should I just come out and ask him if I should move on?
Should I move on?
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