Is it normal that i keep a girl's thong?

So I was at this party, and after drinking too much, my cheerleader dreamgirl dragged me into the bathroom and started giving me a blowjob. I started to rub her vagina outside of her thong, but people started to knock on the door, so we just left. before she left, she told me how wet she just got, and gave me her thong, and i just put it in my pocket. The next day, i woke up and found it in my pocket. The smell of her thong gets me horny, and so i still have it, but should i get rid of it? Once again, she has been my crush for like 8 years, since i have been ten.