Acting strange

So me and my bf been otp all day today. He always has something to say to me or talk about but he hasn’t said a word or tried to have a conversation with me all day. I would be the one to ask him questions and he usually answers it and makes it fast and short. I asked him why he’s acting different today, he says he just has nothing to say but it’s been all day. Even when he doesn’t have anything to say, he sparks up any convo with me.