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

(Sorry if I mess something up, this is my first post EVER). So me and my girlfriend have been dating for around 8 months now.  We go to different colleges in the same state, so it's technically long distance but we're really only 45 minutes away from each other.  In the past I have joked around with her about cheating, but it's always been apparent that I was joking (or so I thought).  She has never been the type to party so tonight I decided to go out without her (like I usually do), and I told her ahead of time I would be going out, called her, and she said goodnight and everything. She texts me at around 1AM with this: "[my name].. tell me the truth... How many times did you bring a girl to your dorm drunk and high, had sex with her, started going at it while your roommate was in the room, not remember anything happening because you blacked out and your roommate had to tell you the next day? How many times have you done this, but actually remember all this happening? I can't believe you..." No she sometimes jokes with me, but seeing as we had already said goodnight for the day and the fact that this text gave off the 'specific situation' type vibe I decided to call her.  She doesn't answer the first few times so I text her and call again and she answers.  She seemed very unresponsive and claimed that everything was alright and kept trying to find excuses to go to bed or get off the phone.  I ask if she was joking with the text and she says no, but I got nowhere so I let her off the phone eventually.  I don't know what to do. It's sounds like she thinks I'm cheating but I just have no idea where all this came from!
<bot>: Girlfriend of 8 months sent me a random text possibly claiming I'm cheating without and hints of why she'd jump to that conclusion.