In other words: She tells you (...) and her girlfriend tells you (...)Ok here is the reasons that i believe she is who she says she is
1. she tells me she is constantly bored
2. her friend bet my roommate 20 dollars that we wouldn't have sex because "thats not who she is"
3. She is constantly busy with work and school.
4. I have yet to catch her lying to me.
And you already know that her girlfriend is wrong about her.
So it comes down to she tells you (...)
Once again you KNOW she's not a slut, but only because she tells you so.
Nah, you can't know that for sure.
But that's okay. My previous advice still stands just take it easy, and don't do anything stupid like having her move in with you.