I apologize this will be quite long

Okay so I’m 21F and I have a sister that is 24. We had a lot of shit happen in our lives but this takes place in 2019 when my sister just moved back to our town prob a year before (had been gone for 2 years after she was sent to live w our dad in a different state bc she was doing some stuff that my mom sent her to live w our dad & then he died so she moved back) but I had this friend that had a crush on her (we were like 15, she was 18) and she was just like ew (obvi) and then continued this for like 5 years, bringing us to 2024. I go to a college in a state like 2,000 miles away & one night she calls me at like 3am and is like guess who I’m about to hang out and I’m like who and she says ____ & I’m just like why and she’s like why not and I’m like well why would you and then she tells me that I can’t be mad or have an opinion because I decided to leave & I’m not there anymore (which btw she has gotten mad at me so many times while I’ve been at college and constantly reminds me how much I hurt her and my mom) and I just hang up on her bc ouch and she’s literally outside one of my best friends house waiting to call me. & then she Venmoed me 50 bucks in the morning and told me to stop being a brat and then I was talking to my best friend (also best friends w him) and I was like oh blah she told me this and Venmoed me this and I’m like wtf and she was like well he told me he fucked someone the other night but couldn’t tell her who and we pushed him then he admitted her but I hadn’t talked to her about it. And then me and him got into a tuft and then he yelled “and that’s why I fucked your sister” I was so mad but still didn’t say anything to my sister. But the other night my mom and I were talking about betrayal and being hurt and I said how my sister did this and she said she knew but she didn’t understand why I was so upset and I was saying just bc she’s known him since we were basically children and has never had an interest and then like basically hit me w that indulgence & also how I’ve always let her know how uncomfortable that would make me and how she mentioned once he was cute and I was just like eww he’s my age and my friend like idk just like her friends have always shown interest in me but I’ve always been like ewww ur my sisters friend(which we’re not super far apart but she did watch us grow ip and she always said the same ab him) and how it’s just weird to me considering we e been friends for YEARS. but my mom was just like well they’re adults why are you upset about this which like what she watched us grow up and spend years being friends and experiencing life together, but idk my mom never told me & acted surprised when I told her then when I was upset she didn’t tell me she told me she doesn’t understand why I’m upset & my sister still hasn’t told me & when my long term friend told me he told me when he was mad at me an turned it into a joke & my fault & we haven’t spoken a word to each other since then but I do know for a fact I would’ve never been that upset at him if it wasn’t for this situation . I feel like they’re all making me feel crazy & feel like I’m in the wrong. I just feel very betrayed and just hurt by my mom(I never thought my mom would lie to me and tell me my feelings are wrong), sister, & long term friend. AITA?

They’re coming to visit me in June and I really want to say something and talk about it but I’m so scared I will still be in the wrong for my feelings that whatever I say won’t matter.