My friend done the same thing, Well not exactly but sort of, He was with this girl a few nights(paid her) and we brought them to phi phi with us, Anyway as we paid for the trip he assumed that he did not have to give her money(genuinely). Anyway she was on good terms with the BG I was with and she told her but said nothing to him, And she then in turn told me, So me thinking I was doing a good thing told my friend and he went to her bar that night and pretended that he forgot and gave her the money, But he didnt take her that night and went and got a different girl for the night.
Anyway the girl I was with was a bit stroppy that night, So I asked her what was wrong, She then blamed me on her losing face because I told my friend what she had said to me, And thought that was the reason why he didnt take her friend, So I got the blame for doing a good thing, You just cant win
PS: I think your friend knows quiet well he should have paid her, I think he was trying to boost his ego
