Is it a normal girl hand-feeding her guy friend who already has a girlfriend?

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Am his girlfriend and I wasn't present there. He did text me that he got fed by one of his girl friends since he was busy writing something and I didn't know how to react. He said she is like sister to him.
I have seen him holding hands with his girl best friend before and I was quite upset but tried to understand but this thing I don't really know whether to ignore or not
Is it a normal girl hand-feeding her guy friend who already has a girlfriend?
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