He can be really bad with texting anyway so i cant read too much into it really, though i still am most of the time! He will often take a couple of days sometimes to text back, especially over the weekend. I think once he even took a week or so and then text being like im sorrrrrrryyyyyyyyyyy. I know work is a bit manic for him at the moment and weekends are always busy so we'll see if he texts back over the next few days or not i guess.
sorry but i think you're making excuses for him. a text takes what all of a minute to send. he doesnt have to say anything deep just hello how are you keeping etc. think he's playing with you but i know its hard to resist so good luck with it