I'm currently in a 7 month LTR and I feel like expiry date is due.

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What I mean is that I've reached the point where I got bored my gf and I don't know which path to choose. We have sex very often and the relationship is going overall good, but I simply got bored of her, I don't find whatever she has to give interesting anymore and I think I have to do something about it.

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Recently, I got a lot of attention from her best friend. ( Lots of kino, iois, you name it). We spent the weekend together and from the outside it looked like we were in a relationship. At least from what I've been told. Honestly her bf is a pussy and recently they went thru some fights. I also know from her that between my gf and her, she was the first to be interested in me. ( Fact shared directly by her to me last weekend ) I think she might just do the job and that she can spice up my life a little.

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How should I play this out? Should I wait for them to break up and see if she's into keeping it on the downlow? Or should I break up with my gf?

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Note: I'm 17, still in highschool, my gf is one year older than me and leaves for college next year and her bestie ( the one I'm trynna fuck ) is the same age as me and we are finishing highschool at the same time.