Guy I’m talking to no longer likes me….

So there is this guy I met in my art class at the beginning of the year. We became friends and after a while I switched schools. We kept in contact and after a bit he said he liked me. I told him I wasn’t so sure because it seemed super fast. We stopped talking for about a week before conversation started up again. We texted a lot over the past couple months and he would always call and text me back pretty fast. I’ve started to like him and recently he’s been super dry :( He usually would take 10-30 minutes to text back, always super interested and if not say he was busy. Now he’s taking 3-4 hours to respond and doesn’t say much, even if I respond fast. I know we aren’t dating so I don’t feel like bringing it up because I’m embarrassed…any advice?