Does he know and don't want me to tell him?

Ok so today I texted my crush to tell him I had a crush on him. Within the text there was some small talk and then I said "there's something I want to tell you but I was too shy to tell you" he said don't tell him. I had a feeling he already knew I had a crush/ liked him. But, I just think it's funny/ weird that he didn't want to know what I was going to tell him. Do you guys have any insight?!