What can i do if i dont like my boyfriend stepdad?

i have been with my boyfriend for 2 year and he liked me a lot but than i had writ something on face book about him i did that beacuse sometime when i sleep over my boyfriend his mom and his step dad would say some mean things or i would have with my boyfriend all day and i would go to the badthroom i would here them talk about me and my boyfriend he would say something back to them and than his mom would cut him off and she things that she rite about everything and like yesterday my boyfriend gotta get tested and his mom told me that she dont like when people hide things from her and now i feel that i am a side girfriend like my boyfriend just have time for his mom and never me his mom tell me he really do care but on the orther side of her face so i dont really i am a rite girl for him beacuse everytime i think am doing something rite for us it end up being wrong so now i feel like i dont turst his mom beacuse somethime i feel really dumm about myself beacuse the mom is always in the middle of things i need help