It means that they do like you but it is a secret code so they have you thinking what it means all day so when someone says that just remember they do like you maybe more than you know.
Hey Austin I know you said you like me but I don’t not like you.
Means she does like you in a secret message she didn’t want you to find it out right away because she wants you to go crazy over it
Hey Austin I know you said you like me and I don’t not like you