Why can't I just let him go?

So I met this guy around a year ago, and we stopped talking for about two months after I told him I liked him and all this stuff happened. But once he found out I was with someone, he texted me. Now every since I got that text, me and him talk and hang out sometimes. I told him again how I felt about him, and again he ignored it. I tried & tried to get over him, but somehow I can't. Like now his best friend talks to me, and we hung out yesterday and we met up with that guy I can't get over, and his expression on his face looked like he was jealous, and he flirted with me and later that night he texted me. Which leaves me completely confused. Because I know he's not that interested in me, so Why can't I get over him?
Why can't I just let him go?
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