How do I tell a married man to back off?

Anonymous
So I ran into this guy who is already married but it's pretty obvious he is a massive flirt and somewhat a show off. I treated him very normally and kept a little distance from him in respect to his wife. But he was like way too forward, doing everything to grab my attention.. staring right into my eyes...trying to touch me.. and sort of behaving like he is still available. I was really uncomfortable and I don't know how to subtly ask him to back off.
How do I tell a married man to back off?
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