does she love him or what?

now it's me again and last time i asked a question about a girl who got a boyfriend but behaved so strange to me in a way that i think she may like me and now i know she doesn't really like me. however, does she like the guy that she is now staying with? they never talk to each other in public? and basically everyone knows they are going out? why did she do that? sometimes, even worse, she did talk to me in front of her boyfriend in a very 'close' way. which makes me kind of avoiding her. how should i response? and if i try to ignore her, what should i do best to not let her down and not make her boyfriend get mad?
(basically she is a slut, i guess, and i tried to avoid the two of them most of the time cause they are both trouble people. any suggestions to make me look nice but still reject her from talking to me and approaching me and not make her boyfriend angry? i did being rude sometimes but i am still nicer than them consider their behavior.)

更新1:

basically i have to say as in my last question i am never interested in her, now i even hate her cause she is making me look like a jerk in front of his boyfriend that i tried to destroy their relationships. i am asking how can i avoid her and make her ignore me completely, also i want to know what is she thinking? does she like him or not? i know she doesn't really like me or maybe she does after someone said that again. also today at dinner, she smiled at me and tried to talk but in a very challenging way (as she is always like that, but more challenging this time and i haven't talked to her for like 2 weeks) what is she trying to prove? what is her intention? i am so sick of this kind of trouble making girl.

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