he hasn't responded all day ?

there's this guy i like who's come into my job for a couple months now, but as of recently, have been chatting a good amount every day for a couple weeks now. i feel like we've mutually clicked and can see being in each others future. we were supposed to go out and had to cancel due to a situation on his end, it's been a couple of days and he's been lagging but because he's at work or getting rest, and he's communicated that with me. now, i texted him this morning and i haven't gotten a response all day. it seems a little out of character but i'm really just hoping he's okay. i understand he has a life of his own but is there anything i should be worried about ?