Girlfriend (33F) came to me telling me she was assaulted the night before. I found out she was lying because her credit card usage placed her at the other side of the city. I brought it up, and she left me. Turns out it happened a week ago, she just lied about the time it happened. I feel dumb.

I feel really dumb. Girlfriend came to me and said she needed to talk to me about something, and she said she was assaulted the night before in bay ridge. At first I was absolutely devastated, then I remembered, what the hell? She used her apple pay 4 times in the upper east side that night, and then used it to pay for Uber home. There is no possible way she could have gone to bay ridge in that time. I didn't bring it up at the time, I didn't want to push buttons.
But later on, I went to her, just confused out of my mind, and straight up asked her why she said she was in bay ridge when she wasn't. I didn't want to accuse her of lying, but she definitely took it that way, and right away freaked out at me and was crying and stuff. She didn't even explain what I had found, she just said I was ****ed up for denying it happened and all this stuff. I assumed she went downstairs, instead she just left.
My biggest fear, and sorry if this makes me sound like an ass, was that she cheated and had got an STD and wanted something to blame it on. I know its irrational but at that point I couldn't imagine why anyone would lie about something like that.
So later on in the day I called her, and she just said she was sorry for freaking out and she is sorry for lying. It happened a week ago, and she didn't originally want to tell me out of fear because she said she was afraid I would overreact and call the cops which she didn't want. She said her friend convinced her to tell me. But she didn't want to sound like she didn't trust me, so she said it happened last night instead of a week ago.
I told her to come back, and she said she needs some time and she isn't sure and she is extremely upset that I didn't right away believe her about this. She kind of said all this stuff about how I should have trusted her right away on such a sensitive topic and that insinuating assault victims are lying is horrible.
I really don't know what to do. Because... she did lie. I know it was special circumstance, but she did lie about it, which indicates she didn't trust me enough, or that she thought I would overreact to her saying it was a week before.
What should I do? I am not sure who was right or who was wrong in this situation, and I really love her. We've been going out for 3 years now.

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tl;dr: I said my girlfriend might have been lying about an assault and she left me. I found out she wasn't lying, she just mixed up details. She left me, I dont know what to do.


Source.