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Clear conversations are the only way to go about things like Just a woman who wore combat boots shirt. If I were you, I would get these two people in a quiet and relaxed place. I would sit them down. Get some coffee/tea or water or sparkling water or coke, whatever all of you prefer and tell them all the facts with as less drama as possible. If I were you, it would go something like this. I need to tell you two something.
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You both know that I love Just a woman who wore combat boots shirt and that you are the two most important people for me in my life, at least at this point of time. But, there are a few things that you two do not know. “GF Name”, you know something that “Best buddy name” does not know about us and vice versa. So, let me get all the facts on the table so that I do not end up loosing both of you. You do not know this yet and I am sorry I did not tell you earlier but the gf and I have been in a private relationship for 4 months.