Scared of starting something?

so my boyfriend and i have been going out for a month now and i guess everything is going fine. He just had to move to a different school so its been kinda hard to see him. Lately hes been acting distant when we text he usually answers with one word and he used to say a lot more and tell me sweet things and now he doesn't. We haven't seen each other in a week and i really miss him and i want to ask if anything is bothering him but i don't want to be that girlfriend who is up in his business but hes just worrying me a bit. Should i ask him whats up or just leave it? Your advice is greatly appreciated :)