NEED SOME ADVICE

hello guys,im sad right now knowing that my bf. Doesn't ready to introduce me to his family. Were 1year and 3months together,I already introduce him to my family last january , and a lot of time he visit to our house. His birthday is coming in august, I want to go on their house to join the celebration of his birthday but he said to me that his not ready to introduce me to his family, we got an argument rightnow because of that, I think he's not sure about that's why he doesn't introduce me to his family. 😔😔😔😔😔😔😔