<human>: Can you provide a brief overview of the text?

I'll start with the lie: Six or so months ago my GF and I had sex, she was a virgin and I was not. It was mutually good for both of us, nothing bad happened or anything. Later the next day I'm telling one of our mutual friends about it (we'll call him Bill.) Bill is a good friend of mine and is dating my GF's good friend (we'll call her Jess.) So I'm telling Bill about it, nothing too detailed, just that it happened and such. The following day, so two days after we have sex, my GF tells me not to tell Bill and then asks me if I told him, so I say no. Cause I told him not to tell Jess about it, and she told me after I already told him so I didn't see much harm in this lie.

Fast forward to today, my GF and Jess are out of state together for spring break. She texts me this morning (should be noted that she doesnt have great service so we don't text often and calling isn't an option) telling me that I wasn't being honest with her about something that I told Bill about, and that she wanted me to think of what it might be. After an hour or so of me not being able to think of it, she tells me about that lie that happened 6 or so months ago. We start arguing about it which lasts maybe 2-3 hours over text. She's never been mad or upset with me before up until this point and was aggressive in her questions, and I was very passive while arguing with her, not pointing out lies she's told me or that this is my first major hiccup in the nine months we've been dating.

She ended our conversation with "You've completely broken my trust and I don't want to talk for the rest of the day because I'm having a great day with my friends and I don't want this to ruin it." Which is pretty uncharacteristic cause she often texts me whenever she can. Is she overreacting or did I fuck up?
<bot>: GF caught a lie I told her half a year ago, and is now busting my ass for it while 8 hours away through text. Is she overreacting?