some guys arent into txting
guys do that. they feel they don't have to. don't worry about it. women tend to agonize about things. let it go he will text when he is ready.
may reasons to no reason.....to aggrogance.....and ego or he's just not interested....move on....someone will be.......don't sell yourself short.......
because he is quite busy
Some people don't have their phone permanently attached to their hand . I can go for days without checking texts , if people want to get in contact for an important reason they'll call .
Maybe he is busy at the time, or not free to text back immediately.