If it is even possible, but you guys at least claim to understand female nature so ill ask. So 2 years ago when i started high school, i had a thing with this girl, whom i later found out is quite loose if you know what i mean. She sucked my dick at a party then things got awkward in the proceeding weeks and months at school, mixed signals bla bla, to this day i still dont know if i fucked it up, since i was a complete noob at 16, or if she just lost interest. For the post ill call her Brunette

fast forward 2 years to more recently, im at a part just having fun with friends from the school and some others. Things went well with a couple of girls and was making out with them and later went on dates with 2 (both failed, i think). Here is what i dont understand, Brunette was also at the party, and one of the girls whom i hit it off with at this recent party is her friend. For whatever reason, Brunette got mad at me after that incident. Girl i was with also told me she got mad/annoyed at me after that part, directly as a result with what happened.

After Brunette had seen me making out with her friend and a couple other girls, she looked at me as if she was shocked, or really taken back. She comes up to me in the party and goes "dont you remember, wasnt i your first?" (talking about 2 years ago)

what????? I dont understand the reaction from her, she cant be jealous, since shes been way more promiscuous in the last 2 years than i have. How come?