I just told my boyfriend I'm a little

So my boyfriend and I have been dating for about 4 months. I recently told him I was a little. He said he was willing to try it. So this weekend I went into little space when he was around and he didn't really interact with me. I don't know if maybe he doesn't understand or how to help him understand better. I asked him if he thought it was weird and he said no that he just wasn't used to it. Now I'm scared to be little around him. Anyone have ideas to help?