Do you think that I should ask her out her?

Why not? Ask her out. I feel like she could be some sort of player/slut though. Sorry. Cause if um, my roommate's ex came in and forcefully started to make out with me, when I come back to my roommate, I wouldn't lie and say I went to get a snack. I would've been outraged and if I liked my roommate, I wouldn't wanna hurt her. I'd wanna let her know I'm not into her ex. Sooo ask her out but just be careful ya know?