She acts like everybody owes her something because she's so nice to them. Not kind, but nice. In her mind those two words mean the same thing. For example, she arranged a date with the MC on the day that the MC promised to take care of Sage. She did not call him beforehand or anything like that, yet essentially ends everything with the MC if he happens to tell her that he already made plans for the day and that includes taking care of Sage who's sick. Don't even get me started on her dates with Tybalt. She seems to believe she's doing the MC a favor with that, because she thinks it's best for him. It's just her naivety.
She implies the same thing as "mind your own business" with what she says. Essentially she just tells him to give Bella privacy and that it's not her place to tell the MC anything about what's been going on with Bella. But yeah, you're right, she most likely knows what's behind the door in that room and what she didn't know was that the door was locked.
Sure, she does reject you if you're a DIK, but it's still a bitchy way of rejecting someone when he helps her with the recital and everything, runs over to her to that restaurant after which she tries to embarrass the MC in front of all those people as well as Tybalt only because he's a DIK.
Well, if you read what
ChipLecsap has written on here, Jill might as well be crazy. Her internal dialogue doesn't necessarily prove that she's a virgin though. From what I remember, she talks about "being this way" and not explicitly about being a virgin. I always wondered why it was so hard for her to say that she's indeed a virgin and not just talk around the point she's trying to make.