boyfriend never invites me anymore

Let me start by saying i always have my bf over for family parties events ect. Well this last year i have been invited to nothing. He has left my house to go to a family party at his house and not brought me. I know i dont always need to be with him but its weird cause i used to always be invited. I feel like it should be different now since we are going on 3 years. Idk what to say this has to be the 7th thing this year at his house with his parents that i wasnt invited to. I just feel strange like they dont want me aroynd but he acts like he does. What do i do? Why would he act like this? Our relationship is bettter than ever!