It is worrisome that you all have different "best friends" than each other. Doesn't sound like there is a lot of good communication? I don't know if he was maybe introducing her to other people at the party? I could see if they danced then he "pulled her over" to a group of other people he wanted to introduce her to or that they knew from work, etc. and kept her hand for a moment. It might be okay that it was "public" and at his own house? Not a real "intimate" time?
But getting angry with you for asking about it wasn't a good response unless there's some defensiveness there. Do you know any of the people he works with enough to know how they act at work? What is her position at work relative to his? If they work together on projects or if she reports to him (or he, to her), I can see his having her number in his cell but it does come down to that "best friend" comment, doesn't it? Especially if you don't know her well too.
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"Never give a sword to a man who can't dance." ~Confucius
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