<human>: Can you condense the text into a few key points?

She doesnt remember anything from the night and she doesnt want to. She didnt know she had slept with someone else until i asked her to find out for my sake. She wont explore any further, and wont tell me names, or circumstances from the night (she could find out from one of the people who was there) besides the fact that she did sleep with someone else. She wont tell me who or if she consented.

I guess my question is how do i deal with this? I am a very fact driven person and uncertainty irritates me a lot (hence why i asked her to find out if she did the act). Is this cheating? Or is it something else?
<bot>: girlfriend of 4 years with perfect track record gets her drink spiked in a dodgy country and sleeps with another man, i need advice on how to deal with it.