Why is it like this?

Katie

So the guy I was seeing for a while started acting different and was really distant ( cause he was "busy") most of my guy friends said it's more because he wasn't bothered . He would take days to reply and they would be pretty blunt responses so we decided to be friends. Now he's replying and isnt being distant, being the way he used to be and not being blunt at all. Why has it suddenly changed?