Is my boyfriend cheating?

So it’s literally been 3 days since me and my boyfriend became official and I have like severe anxiety so I’m probably just being paranoid but since I started back at uni when I’m here he always rings me every night before I go to sleep (on messenger because he broke his phone) and he hasn’t tonight and I’ve tried calling and all I can think is, is he cheating on me. Like why can’t he borrow his mom or dads phone to call? He said he would when he called earlier. Am I just being ridiculously paranoid?

Thanks