Throwaway account, also on mobile so sorry for typos!
my sister (26f) got married last month. I (32f) was originally apart of her bridal party as a bridesmaid. Obviously, as her big sister I was extremely happy for her and played a big role in the planning over the past year.
For the past five months I have been seeing a really great guy (25m). It’s a serious relationship and we’ve even begun to think about marriage ourselves. After a couple months of dating I told my sister about him and showed her a few pictures. She immediately became upset and told me that my boyfriend was mean to her in high school. Supposedly, he and his friends used to call her names and made an instagram account dedicated to “bullying” her. I never heard her talk about this growing up. When I asked my boyfriend about it he said he didn’t even talk to her in high school.
I don’t know why he would lie to me especially when I told him I would be understanding if it were true. I told my sister she must be mistaken but she insisted that my boyfriend is her high school bully.
As the wedding approached, I RSVP’d with my boyfriend as my plus one. My sister called me the next day and said that he was not allowed to come to the wedding or any of the other celebrations. I tried to reason with her since she wasn’t screening anyone else’s plus one’s but she can be stubborn.
Eventually, after some back and forth I decided to drop out of the bridal party and not attend the wedding. My family and of course my sister are all very upset with me, but I feel like I’m doing the right thing standing with my boyfriend. AITA?