He casually hugs and kisses?

Me and other female friends of his. He would hang out with us, have dinners, take me or the other girls out 1 on 1 but then he was emotionally and physically attracted to a girl he was not in touch with or friends with.
He liked her since last year and was unlike himself. Always very quiet and shy around her when he's actually very funny, extremely confident, loud and playful. He would give me or the other girls casual hugs, cheek or forehead kisses which we didn't take too seriously either as it wasn't serious.

So how did this even happen? That he would hang out with me or other girls but got her as his girlfriend?
He always keeps staring at her and has a very deep and soft look whenever he looks at her.
He casually hugs and kisses?
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