my only friend's bf doesn't like me and idk how to talk to her about it

so i (17f) recently became super close with this girl (17f)( i later found out my ex bf cheated on me with her and she had no clue about me i saw the text od him saying me and him broke up but we didnt but this was 2 years before me and her met) she has this bf (18m)and at first it was really chill we would all hang out at lunch bc i have been eating alone the past 2 years so it was a nice change but then he would stop talking when i showed up and would act like i wasnt there and she joked that he said she talks about me too much and was jelous of me and didnt like me so i stoped showing up i ignored her text at lunch or was dry making excuses he also had family stuff going on so i js blamed that saying he needed her more than me and i went back to eating lunch in the computer lab or random empty parts of the school now shes saying that he said that hes hurt that i dont like him but it was all him and i genuenly feel so alone like when hes not there its amazing but anytime we hang out outside of school he tries to get her to come over so i finaly told her to js go and she finaly realized im done. there was a possibility he was gonna have to move and i was so happy but now he might stay idk what to do or how to not be so clingy or draw hard boundaries or should i talk to her? what do i say?