Ghosted??

I think my crush is ghosting me? I'm not sure cause he does this a lot where he just won't respond even if he reads it but then if I send a "Hey" later in the evening he'll respond. Like, I get that he's busy and all but like he usually gets back to me and he didn't get back to me at all today. What do I do?? I know I'm probably overreacting with this but if he gets back to me sometime tomorrow I'll delete this post or let you guys know.