Why is he behaving like this?

he is probably behaving like this as he is pre occupied on his holiday with lots to do, but considering you only want one text a day its no excuse. Yeah mention it when he gets back but he sounds a bit pissy so dont mention it as if hes a , just as a general question. I'm uming he may just be really chilled out or always have things going? dont worry too much until he gets back then see if he continues to act this way