in the morning she seemed to have forgotten what she told me
Classic - I've had a pretty similar experience.
My wife and I got engaged when we got back together after a few months break-up. She said she only gave one guy a good-night kiss after a date and danced with another dude. Knowing how my wife is, I knew this was total bullshit but I let it rest, I was just happy to be back together.
A couple years later, after much fantasizing about what happened, I confessed the thought of her with another dude turned me on. She had the typical reaction, got mad, was confused, we talked it out and she finally said she understood but would never, ever, do that. Then we had hot makeup sex, where she was super wet...
🤔
Maybe a year after, over drinks, with some prying and me saying I didn't believe she only kissed, she confessed she had sex with the "goodnight kiss guy"... then eventually that they dated and had sex several times. She felt my cock and knew it turned me on, then later that night we had wild sex.
Another year or two later, again we're out drinking again and I brought up the past breakup again, because it occurred to me, she met me once during that time and let me sleep over, although we didn't have sex, and I realized she was probably dating the other guy at that time. Turns out she was and she defensively says "well I was angry at you and I just wanted to get some dicks!" and I said "whoa wait, more than one dick?" and she admitted she also had a one-night stand with the guy she "only danced with" and fucked him in his apt while all his buddies were in the room outside. That night I felt like we had a break-through during sex as I made her repeatedly tell me how her pussy was soaked from telling me she fucked other men, which made her cum hard, made me cum, and then she wanted another round she was so horny. Next day, it was like nothing happened, she didn't even acknowledge it or want to talk about it.
I finally cornered her and asked "at least tell me why you don't want to talk about it" and she admitted while the fantasy of being shared with other men turns her on, she also feels like its not normal and she said "its very hard for a girl like me to be good and I want to be good for you, and I'm afraid I could get out of control once I start" (I'm like yes, yesss). Basically though, she needs alcohol / whatever hormones hijack the brain and impair inhibition, before she can allow herself to indulge in sharing fantasies. It's like the female version of post-nut regret.
It's crazy though how they can compartmentalize shit and keep a straight face, pretending like shit didn't happen, while obviously, the other person is fully aware it happened.