i (F21) have been with my, now, fiancé (M23) for almost 6 years. we got engaged last december and were starting wedding planning in february. we had a venue picked out by march and were planning to have ~170 people. we were inviting everyone and their mother. in april my fiancés sister (F21) started dating a guy. after a week of them dating she mentioned that she was excited to bring him to the wedding, idk why but this rubbed me the wrong way and i didn’t really want him there. but after looking at our guest list i thought, whatever he can come i guess considering we’re inviting these people we barely talk to. well, fast forward to october… we had a falling out with his family (separate, long story). his mom stopped talking to us until recently and because of everything that happened and things she said about me to people we invited, we began to think a little more about what we really wanted wedding wise. we realized we weren’t having a big wedding because we wanted to, we just felt like we had to. so we canceled our venue and decided we wanted to have a micro wedding instead with our parents and siblings, aunts, uncles and grandparents. so like 25 people max. we really only want people who really love and care about us there. her and her bf are still dating but we’ve literally met/talked to him maybe 2x since they’ve been together. so i feel like it’s appropriate to say he’s not invited, because to us he’s just a random person who we have no connection with. now, me and his sister have never really gotten along. she’s very much a center of attention, everything is about me person. shes rarely ever been told no. so when she asked if her and her bf were staying with her family or getting a room together i politely just said we were not planning on inviting him because we don’t really know him and just really want it to be intimate with the people we know and love. she had a fit about it and their mom said i was being selfish because when we were dating they invited me everywhere to do things, etc.,etc. but i just feel like it’s really not the same thing at all considering they’ve been dating for 8 months now and we’ve met him twice. and in those two times i’ve met him, he’s not my favorite.

so AITAH? should i just invite him?