Why is a guy who is attracted to both girls touchy and very flirty (almost sleazy) with one girl but more cautious and distant with another?

Does he find one of them more attractive than the other and/or does he have a different kind of interest in them for instance one just for friends with benefits and the other as girlfriend or something else?

He is more interested to the girl he is more flirty with
He is more interested to the girl he is reserved around
He wants the first one only for sex and the other he wants to date
Has to do with signals and demeanor of the girls
Other
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Why is a guy who is attracted to both girls touchy and very flirty (almost sleazy) with one girl but more cautious and distant with another?
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