My girlfriend chooses her friends over me? What should I make of this?

I always select my girlfriend and spending time with her over my friends, ALWAYS, without question. However, I have noticed a trend that my girlfriend will at times put friends or other people before me, and then claim to me "I always want to be with you and spend time with you" How do I read this, what should I make of this. For example she's seeing a male friend this weekend to see an art gallery, on the only day we have been able to spend together fully for over a week.
My girlfriend chooses her friends over me? What should I make of this?
My girlfriend chooses her friends over me? What should I make of this?
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