For context: We have been close friends since college, and are both getting married in 18 months. He said he was picking a summer date, I said fall. Our weddings are 3 weeks apart. He asked me to be a groomsmen at his wedding and I said yes ofc. He tells me about 2 weeks ago that my date might conflict with his honeymoon. He has nothing booked or nothing nonrefundable he can't get out of. He claims his plan was to use the entire month of september as his and his fiances 'wedding era' and that its my fault for not asking that my date wouldn't work for him. I think this is extremely selfish. If roles were switched I'd have no problem inconveniencing my dream timeline for a friend close enough to consider a groomsmen. My fiance agrees that she would never let me miss a close friends wedding. I would understand if we booked ours 6 months out and they had these plans, but we both booked so far out theres plenty of time to adjust.
Genuinely curious