It's a blow out.

When this type of situation happens to me it's either because I was not addressing the entire group or because I telegraphed too much interest in my target, woman can sense your intentions from the moment you open, what I do now is if its a question opener, make it a question you genuinely want the answer to etc.

If you go in thinking "OMG I want to fuck your brains out" your done.
I'm no expert and don't know the full story of what happened but hope I've helped in some way. Go in with genuine interest.

Brig