My boyfriend (19 years old) doesn't communicate much with my parents, and I'm unsure how to handle the situation.

I'm an 18-year-old female and my boyfriend is 19. My parents are truly my best friends; I share everything with them. When I first met my boyfriend, we connected immediately, and I care for him deeply. However, over the past year, he has been communicating less and less with my parents. Just before I left, I told him, “I’m still your girlfriend, but I need to take a break from us for a bit.” This was after my mom expressed her concerns about his antisocial behavior towards her and my dad. I explained to him that I always treat his parents with respect, and the situation just feels unfair. Aside from this issue, he's generally a great guy who treats me well and doesn’t have many deal-breaking flaws. For context, he's nice to everyone, but his reasoning for avoiding my parents is that it makes him uncomfortable since they are my parents. I don't really understand this since I’m friendly with his family. I'm seeking advice on how to navigate this situation as I'm feeling quite confused. I love him dearly; he's like my best friend, and my friends like him too. But I also value my relationship with my parents and don’t know how to balance the two. What should I do?