My girlfriend's best friend keeps flirting with me and I think she wants me to cheat on my girlfriend, I don't know what to do?

Kejsaren
Me and my girlfriend have been together for 6 months and we've had our ups and down but we really love each other. Recently I've been hanging out with my gf's best friend a lot, and texting her, and it's just in my personality that im a little flirty, doesn't matter what girl im talking to i always flirt a bit. Most of the time we hung out my girlfriend was there but at some points i was alone with her best friend. Now she texted me that she wants us to meet up, alone, withiut my girlfriend, and she's wondering what to say to my girlfriend so she won't get suspicious cus " u know how jealous she gets" , she keeps flirting with me and suggesting we do things, I don't know what to do, i dont want to cheat on my girlfriend but i dont want to lose this girl as a friend, I don't know how to tell her nicely that im not interested. What's even more weird is I've been having these sex dreams about my gf's best friend, and I've been feeling more attracted to her, even tho i dont want to... I don't know what to do? Pls help.
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Im 17 if its of any importance to the matter
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Aight so i called my girlfriend and told her what's up and admiting that maybe it was my fault too for flirting back to her in the beginning but my girlfriend is gonna have a talk to her best friend and Im not even thinking about the other girl anymore, I will stay with my girlfriend as Paint_bubbles said its just the excitement to sneak around and have both. Thanks everyone.
My girlfriend's best friend keeps flirting with me and I think she wants me to cheat on my girlfriend, I don't know what to do?
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