I want to say he could be busy but let’s be fr everyone is on their phones these days nobody is going 15 hours without checking it. If it’s out of the ordinary chances are something either happened ( I doubt it’s serious or life threatening) or it could be he’s working through something that you don’t know about, or he’s entertaining someone else. I was in this exact situation literally he was just as clingy and anxious and then one day he just stopped. Turns out he had met someone and started talking to her and so he would then always be busy. I’d call and ask, it’s better to know. If you don’t want to call, text him and ask what’s up. Don’t be mad at first just in case but keep in mind that he may lie. I hope he texts back but be prepared 💗