[Jebus]

So i threw a little party and i have a girlfriend. She ended up getting really trashed and i had to take her home early. After she left this girl that i worked with took off her shirt, no bra on, and started getting on top of me. Now i rejected her and pushed her off me several times yet i cannot tell my girlfriend this. I want to but i think she would find a way to turn it around and make me the bad guy. I just want some advice from the girls on here whether i should tell her not.