HELP PLEASE? Boy advice?

I mustered up the courage to tell the guy that I like that I want him. He goes "want me how?" And I suck at expressing my feelings so I told him I didn't know how to explain it. He said "just say it, I'm an understanding person". I just don't know how to explain it. I love him so much and I want a serious relationship with him. I wanna express my feelings for him, but what if he rejects me and doesn't feel the same. I don't even know what to say, he makes me weak and I'm so shy when I'm around him omg. Pls help, FAST!!!
HELP PLEASE? Boy advice?
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