boyfriends mother advice?

AlI • Married ☺️

so my boyfriend's mother likes to talk about me all nice till she is mad at me and it my boyfriend then she says mean things about me but then buys me gifts? She bought me real diamond earrings gave me and bought me makeup I feel bad cause I don't like her yet she's getting me these things it's like I don't wanna make her hate me by saying no cause she would be upset I know her enough to know that I feel kinda guilty but she's so mean when she wants to be and never says sorry ever Idk what to do or do nothing?