Hot then cold

So I've been seeing this guy every weekend and every other weekday for the past months. Hes a single full time dad & I'm a single full time mom. We are currently dating exclusively.. weve been talking everyday since the day I gave him my phone number. But today hes acting right weird like hasn't msged me all day. And when I do msg he replies bluntly ..I asked him if there was something wrong he says no.. yet I have a feeling there is ..I even asked him to call me which he usually does and he didnt. He has two kids who live with him full time and so do I. Am I overreacting? I left his house yesterday and we were fine