If you text "How are you?"
And he takes 2 days to reply.
Then maybe he is not interested.
Maybe. 
lol.. if u wanna be sensitive about the issue then maybe he sick
lo , his phone die.. no credit..mum scold him.
If u wanna tulan about it , then that s.o.b wasting ur time
playing u
If u wanna reason about it , maybe he playing hard to get ? Or
is he the one ? Or u thinking too much ? Or he just treat u like a
friend ?
If u wanna cbb 'cant be bothered' then u... dun bother about
it
If u wanna fantasize about it , he did reply u.. just that ur
imagination havent come out with an imaginary sms from him.
If u .....
n the list goes on.