Should I have with this girl? BEST ANSWER GETS MAXIMUM POINTS!?

This girl came over to my dorm room last night at like 12 cause she said she was all alone. Anyways, I eventually told her I was going to bed so I layed down, and she turned the lights off. I told her she could sleep on the other bed, so she was on it, but then she kept saying "don't fall alseep", and so then she came over and started "shaking me" to try to keep me awake. Then she just got into my bed with me and just snuggled up with me. She then stayed there the whole night and she kept spooning with me, playing footsie, and putting her legs and arms on me. She has a bf, and I take it that she most likely wanted obviously, but I didn't because were on the same sports team and I don't want rumors to spread, cause I don't like her in that long term way. What do you think, should I have next time?