Why would a married guy hit on me?

He’s about 20 years older than me, a family friend. He’ll stare at me, look me up and down, he isn’t shy about it. He touches me any time he can, makes sexual innuendos, he’ll do whatever he can. He’s happily married I know his wife. Just wanna know why. It makes me uncomfortable but I can’t say anything to him

Why would a married guy hit on me?
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