I know its stupid i'm just upset

My boyfriend and I have been dating for 3 years. I have always gone to his familys christmas party on december 23rd and have become close with his family amd their other guests who i used to be coworkers with. Well for some reason I wasnt invited this year. My bf and his family have talked about the party in front of me so i find this odd. His dad asked what we are doing and my bf was like oh yea but havent been asked or given a time or anything. I know I havent been invited but i don't get why because my bf and i are doing great and his parents like me. I just don't know if i did something wrong or what? Its at there house and its not like they didnt have enough room to invite one more person. I'm just taking this way too personal.