He (29M) went on a 5 day festival and not texting me (26F). How would I react to the situation?

I 26f dating a 29m for few months. For a month now we are in LDR as he is back in his home country. We always text and update each other everyday. Lately this week, before the festival started, he was so busy that we didn’t communicate properly. The day before the festival I asked him if everything’s okay and he just sent me a video of his car with all of his and his mates things packed. I just sent him have fun at the festival and since then he never texted me. Its been 4 days now and he hasn’t texted me yet. I know he is living in the moment but idk if he even thinks about me too. I’ve sent him a text earlier too before the festival that I wouldn’t mind if he will go MIA and I will not expect anything. I know I’ve said that but deep inside me, its sad because he really didn’t message me. I also know that sometimes, signals are hard in festivals and also charging phones. But it still makes me worry. I don’t wanna text him to sound desperate and I want him to text me first after the festival.

Should I be mad at him for not texting me? I don’t know how to approach him when he will text me. Maybe I’m just being anxious and needy. I hope you guys can help me.