WIBTA for making sure my BFs brother knows the reason we're not going to his fake birthday is because his GF uninvited us when we said we couldnt do it on my BFs actual birthday
So my boyfriends (27) brother (31), we'll call him Greg, has a birthday on Christmas eve. Because of this, my BF has always done a 'Greg fake birthday' around June to make sure Greg gets to properly celebrate his birthday with all his friends around. This year, Greg's girlfriend, we'll call her Polly (28), is organising Greg's fake birth day.
Since getting with Polly, Greg has started slowly cutting ties with everyone in his life. BF has barely seen him the past year and everytime they do see each other ends with Greg claiming BF has somehow upset Polly over nothing. Polly practically refuses to see BF and makes sure Greg does this too. The reason Polly hates BF is cos Polly was originally dating Greg's best friend and when Polly and Greg got together immediately after the breakup, BF refused to lie to their friend, her ex, about it.
Anyway I could say so much about whats happened but thats not what this is about.
A few months ago, Polly made a group chat to try and organise this fake birthday. She suggested late august/ early September, to which my BF responded that we wouldnt be able to do the 25th because that is my BFs real actual birthday and so we'd be busy. Polly then kicked us out of the group chat and went on to organise Greg's FAKE birthday to be on my BFs VERY REAL BIRTHDAY, on the 24th and 25th.
Everyone else is under the impression my BF and I refused to go and thats why we aren't involved, which is not true. My BF is the maker of Greg's fake birthday, of course he wants to be there.
So, WIBTA if I make it clear to Greg why we aren't there. My plan is to send a message on the 24th saying I hope he has fun, we would have loved to be there but Polly kicked us out when BF mentioned he was busy on his real birthday, and that hopefully next year it'll be a different time and we can make it.
I know for a fact Polly is telling him we've chosen not to come because we dont like them, which is not true. Again, it is my BFs real birthday, of course we're going to be busy.
Edit: Thanks for the advice everyone. I think Im just going to leave things for now. I might message Greg to ask him what hes getting BF for his birthday, that way in the small chance hes forgotten he'll be reminded. In terms of the party, I might message him on the day tell him I hope he has fun, but leave it at that. I dont want to stir the pot, and if he wants to know why we arent there he can ask, but at least he knows hes not forgotten