Am I Crazy?

My SO and I don't live together, we see each other twice a week after work (on average), but we text consistently. Whenever I go long periods of time without texting him, I apologize and offer the reason why (got busy at work, fell asleep, was in church). So today he goes several hours without responding to my last text. Then he just asks me how my day was going... Hours later. I'm pretty upset. I know it sounds childish coming from a grown woman, but it is what it is. Anyone else understand? Or am I crazy?