What shud i do...pls help

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thrs this girl in my life wid i'm goin arnd for quite a long time....even she likes me....but now thrs one guy who wants to have her as his girlfrnd....she explained to him about our relationship but he still bugs her a lot....he also tells me to stay away frm her...i really love this girl but i'm also scared of this guy coz he's too helthy than me....pls help wat shud i do?