If a girl puts her hands on a guy's stomach/chest is that her ultimate expression she is into him?

yesokfine
I was at a club with a friend and we were watching this cute girl hanging with a guy and we were debating if they were together. Then she leaned into him a little and put her hand on the guys stomach affectionately and softly and rubbed it a little as she smiled at him.

My other male friend was there started laughing and said once a woman does that to a guy its all over and that is the ultimate sign that she is not only with a guy, but that she is crazy about him-the ultimate form of pda even more so than kissing. Ladies do you think that is true?
If a girl puts her hands on a guy's stomach/chest is that her ultimate expression she is into him?
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