We have a casual ual relationship, why does it take him so long to text me?

we go on dates, we chit chat over text, poe fun at one another.....I see him everyother weekend, we have , I leave whn he falls asleep, he doesn't usually text me the next day, but when we do it's all day. It started that I don't want a relationship, but I want him to care a little more now.