What if a "friend" did this?

so a while ago i confronted this quote friend unquote about this silly situation, she was basically flirting with the guys i said i liked and has been trying to make me jealous or something like that anyway, when i asked her why she would do that to me she had NOTHING TO SAY (seriously after i asked her she changed the subject) ijust want to know if u guys can help me out... why do u think she had no response ???? please and thank you.