My boyfriend threatens to break up

My boyfriend threatens to break up with me when he gets mad and calls me dumb. I changed for him, i became sweeter and more attentive and caring cause he likes that but i fee like im begging for him to be with me, he hates when i cry cause he says im too emotional and get butthurt easily. I love him but im in a roller coaster where one day im so in love and he’s so sweet and tells me im the most important person ever and the next day he tells me hes done and wants to break up and blames me for acting like that its always oh you said something that made me mad so im acting like this cause of you oh i called you things cause you made me mad. I dont know how to show him that i love him and im getting hurt everytime he acts out