When a guy only responds with two thumbs up?

Anonymous
I am not really a good texter, I take time to respond to texts because I get busy or don't see the need to if its not a question. So I started talking to his guy and we hang out from time to time and we have a great time talking to each other but when it comes to texting, our conversation dies real quickly. We don't have the normal "ey, how're you doing?" conversations, when we text, its either to make
plans or xhange information. So sometimes I take 3 to 5 hours to respond and he the same and sometime we both respond immediately but never continue the conversation.

Now he has started responding with two thumbs up when I ask for a favour or confirm plans. What does it mean? Why doesn't he just text normally? Does he not want to text me or what?
When a guy only responds with two thumbs up?
3 Opinion