AIO For breaking up with my now ex thinking he set me up for his sister

So this story was a little longer ago but now that I think about it I feel like I wasn’t crazy for believing that.

This was like 4 years ago and I still get chills when I think about it.

one day my now ex bf invited me over to his house where I wasn’t welcome at the time because of “cultural differences” ( his mom wanted him to date a girl from their home land ) However when he used to invite me I couldn’t say no because I didn’t have a place for him to go to and it would be a little to public to be outside doing what we doing. One day his Mom started banging at the door like crazy and I would guess said something along the lines of “get her out of here”. He would just laugh it off but I would feel terribly uncomfortable and I started gathering my stuff so i can leave. He insisted that I stay and that shes just angry because he wouldn’t ask her for permission for me to come over. I wanted to stay but his mom was just smashing plates and probably cursing me out in their native language. I left.

A week goes by and he now has free crib. Meaning his mom wouldn’t be there so we would be safe… so I thought. We hang out and listen to music ( no inappropriate stuff ) when I suddenly hear steps and a singular knock at the door. Confused I look at him he looks at me and goes “dw thats my sister” your sister??? sir i thought we had free crib. I knew his sister from a couple encounters we had at a school we studied together where she eventually got kicked out off. Short notice: She stole like 7 dollars from my purse that she found and didn’t even give back to me she just told me where the purse “fell”. She also smoked cigarettes in breaks like we are not in SCHOOL?.

Back to where she is infront of the door. My then boyfriend steps outside and starts talking to her telling her to calm down. She said something along the lines of “mom said she couldn’t come over” “Come outside i know u in there”. Meanwhile im in there just confused because she sounded even more mad then his mom. He came back inside and said “don’t worry she just overreacting, shes doesn’t mean it like that” to what I responded with “I am not coming back here”. THIS is when everything went downhill.

A couple MINUTES not hours MINUTES all of a sudden he needs to go to the store and told me to stay there so his sister doesn’t see me. I had a very bad feeling staying with his sister under the same roof and told him to close the door just in case what he had agreed to do. When he stepped outside to go the store I went to the bathroom ( bathroom inside of his room ). While im sitting there with my heart RACING off the scale I hear the door opening slowly and somebody walking around the room AND sitting on the bed ( probably waiting for me ). I did not make ONE sound even stopped breathing just because I hate confrontation and she is very agressive. My bf got back from the store and came into the room and thats when I heard her say “where is she ?” He said “Idk” Thats when I got out of the bathroom and she started going AT ITT. Calling me all types of names threatening me shes going to beat me up. I started laughing because atp I wasn’t scared anymore I was just overly confused on why she is overreacting ( I also like seeing people mad at me and they cant do shit abt it ). When she was done being a weirdo I asked him why TF he wouldn’t close the door as I told him too and he said “ I didn’t see a reason why “ I got home and blocked him no explanation no goodbyes. Im not getting beaten up over a guy so sorry.

Now I know I can’t reverse it but he just texted me after 4 years asking for an explanation on my “OVERREACTION”

I don’t think I was overreacting and I stand on that

I need a third party opinion tho, Could it be that he really didn’t know that his sister was going to come in the room or was he setting me up?

Ps: not considering going back, I now have a bf, he knows my ex texted me and im posting this because it gave me anxiety and PTSD getting flashbacks on that.

I do think I owe him explanations on his crazy sister tho.