How to tell a friend she has double standards?

My friend was just telling me about how her boyfriend has a girlfriend she doesn't like because they always hang out together. I sat there not knowing how to respond because she always has male friends around and holds their hands and sits on them and such ! This is when her bf is at college btw! She is jealous of this girl constantly being by her man even though the girl has a boyfriend. How do I tell her she has double standards with out ruining our relationship?

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