If he doesn't make an effort to text you and ask you how you're doing or how your day is going, then he probably just doesn't want to know because he's only interested in a hookup. This is one of the clearest signs you're just a hookup. As the conversation between two people who are attracted to each other grows deeper, the everyday anecdotes and stories grow more heartfelt and serious. Different couples have different morning routines, but spending the night in the same bed and waking up together with the first sun rays is pretty much a definition of a relationship.
So you haven't been able to see each other for a few days because life has been busy but you miss the sound of their voice.