What does it mean when a guy wants you so badly?

Why he tell all his friends about me that we were in a realtionship (we don't, we never talk!) and he still love me and wants me (having sex with me!). He filters with me sexually in the public area in front of his friends too and his friends act silly, filters with me sexually too!!! All the people know there is nothing between me and him and he acts like I am for him only. All my classmates and people and world knows we like each other and he chase me and in his insta account shares many sad posts about realtionships and that refers for me and him. Why he didn't leave me alone and go?

What does it mean when a guy wants you so badly?
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