Annoyed!

My bf didnt text me all day and honestly i was worried about him cuz he didnt even text me back or anything. So he finally texts me and i ask him why he didnt text me and where he been amd he says "idk". Wtf?!! I know this might sound juvenille for me to be upset about texting but its not the fact that he didnt text me that bothers me its that i was worried about him and i apparently dont even deserve an explanation?