my (17f) boyfriend (17m) and i broke up rlly recently

as little as a week after, i find out he’s talking to a girl (let’s call her Claire)

i have many mutual friends with claire, one of which is my best friend amy. amy and claire are super duper close, and amy has been telling me recently “oh you know that claire really adores you right? she thinks you’re amazing and really wants to be friends. would you be down if we all hang out together right?” to which i said i would respectfully decline. i was honestly shocked because ive never really talked to claire and also like.. she’s my exes new rebound? i wouldn’t hate her per se for liking my ex. however i do dislike the fact that she was into him while we were dating & is going out w him so soon after the breakup. i don’t hate on her to other people but it does leave a sour taste in my mouth, though i keep that to myself.

in addition, claire now waves at me and says hi when we see each other. we have literally never interacted before this so i was kind of weirded out as well. i hesitantly smile back but i think she can tell i dislike these interactions

my other mutual friends have also weirdly been pushing me to maybe talk to claire or become friends. like sometimes we’ll talk about something as arbitrary as a cafe, and they’ll mention “oh yea u know claire also likes that cafe? she mentioned that she thought u had great taste in coffee too” or something, and im just like.. okay??

am i crazy or is it valid for me to have my reservations in this situation? i have never hated any girl that an ex dated after me, because they have done nothing wrong. however i think deep down i hate claire because of how soon she got with my ex and it was pretty obvious she was trying to make moves while we were dating. again i would have no problem if she was just some girl my ex started talking to after getting over the breakup, but even then i wouldnt want to be friends with her bc i just want a clean split from the relationship.

i don’t want to be friends with claire nor have anything to do with any of my ex’s friends. i feel bad because i keep hearing that she thinks im cool or whatever and wants to be friends and is scared i hate her. aita?