Y doesn’t he want to tell his parents about me

So I’m in grade 10, I’ve been dating a grade 12 for 5 months now. I like him SO much. I’ve never felt this way about a guy. Our parents don’t know about us being together. I want to tell my parents ASAP and I want him to tell his. Today I asked him if he would and he said “idk I have to think about it”. I’m worried that maybe he doesn’t want to tell his parents about me. He definitely doesn’t jump at the idea. I was hoping to tell our parents soon but I don’t want to bring it up to him again cause I don’t wanna come off as pushy or annoying. Also this isn’t the first time I’ve brought it up before and he kinda avoids the conversation. What should I do