Hiding.

My boyfriend has not told his parents that I am pregnant. He keeps saying he will tell them, then he changes his mind. This is his first child, and my second. We've been together for 3.5 years and are living together and he wanted to start trying, so the pregnancy was a surprise, but not crazy that it happened. What gives? We've to my whole family but he hasn't told anyone yet. I'm very worried his parents will hear from someone else before he tells them and he seems to think that will never happen. Im trying to be understanding since this is his first biological child. But I'm worried.