Guys, Boyfriend hasn't texted back in 24hours after I gave him a bj for the first time? What does this mean? Why?

Anonymous
First of all, understand that he is not that kind of guy I'm pretty sure I'm only like his second girlfriend. We were friends first, met months ago at this university leadership conference got really close and stayed good friends this year, a few months ago we confessed we had feelings for each other and have been seeing each other since then. He's sweet, funny, and always tells me how amazing I am and told me that he loved me last week. I have never felt this sure/safe about a guy before. I've told him I'm not ready for sex and we talked about it and he's been really sweet from the beginning about taking things slow and always asks a hundred times if I'm comfortable/if what he's doing is ok. Recently things sort of have been heating up when we make out and I let him touch me down there and he gets me off but I told him I wasn't ready to return the favor so to speak. So a week or two went by of that and it was amazing and I felt so comfortable with him that finally I decided myself that the next time I would ask if it was ok for me to go down on him. He was really concerned and said he didn't want me to feel like he was pressuring me and only if I wanted to- I told him I wanted to try it so he said ok and seemed to really enjoy it and honestly I did too ;) afterwards we were lying in bed talking and I told him my sister was stopping by today to drive me home for a few days (I have a bit of a break between exams) if he wanted to meet her? (I've already met his parents) we were at his place but I said I'd head home, text him when to come over (I had to clean up and pack my bag for home still) and he seemed happy when I left so yeah. My sister got there so I texted him to come over but he never texted back. An hour later I called because my sister wanted to head home soon but he didn't pick up. I texted him goodbye and he still hasn't gotten back to me but he's been on snapchat/ FB? Help? I really love this guy and I don't understand he's not normally like this?
Updates
+1 y
Should I text him? or wait for him to respond or something?
Guys, Boyfriend hasn't texted back in 24hours after I gave him a bj for the first time? What does this mean? Why?
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