My Girlfriend's best friend hates me. What to do?

I think my girlfriend's best friend (a girl) hates me. She never talks to me in a good manner nor she looks up to participate in plans I make for our group. Sometimes she also instigated a feeking of untrust in my girlfriend because of which we had a long fight. I can't say against her best friend for obvious reasons. I don't know what's wrong. I'm very loyal to my girl. She is also happy with me. I bring gifts for both of them. We hangout together. Still she hates me. Please help me with this situation.
My Girlfriend's best friend hates me. What to do??
My Girlfriend's best friend hates me. What to do?
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