How do I get a guys attention?

I am completely head over heels for one of my guy friends, but recently he has completely left. He won't talk to or eat lunch with me anymore. He used to do those things every single day, but at one point it just stopped.
I want to get him to talk to me again, as well as give him hints that I may want to have more of a relationship than just friends. How do I do this?
How do I get a guys attention?
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