If a girl says I thought/ was thinking about you last night, but she has a boyfrirend, what does that mean?

usually I guess it would mean that she likes you, without having a boyfriend, but why would a girl say this if she does have one? and there were other people from work around. she knows that I was single, and she even set up some online dating account for me because I am that bad with girls, but that was after.
If a girl says I thought/ was thinking about you last night, but she has a boyfrirend, what does that mean?
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