How to deal with a liar?

My brother is a compulsive liar to the point where he even lies about the tiniest things. He'd lie about what he ate, or what movie he watched, and of course about bigger things (made up friends, girlfriends, job, etc.). He's 30 years old, and he takes 0 responsibility. He lies about literally everything. I don't know how to deal with it anymore. I can't even talk to him, I feel so disgusted. What would you do if you were in this situation?

How to deal with a liar?
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