Cheater or not cheater

Hi guys I need your help because i want to if I'm going crazy or not about my husband who lives in another country. Ok my husband i been married now for 1 and half years but we live in different County. He lives in UK and i live in states but we see each other very two months. I'm getting ready to move to UK. But my just started some new I didn't understand. We talk every day video chat, txt, phone call. But two weeks ago he started turning off his phone. When I ask him he say he will be sleeping or he is tired. And people kept calling his phone. So now I'm thinking maybe he's cheating on me or he's hiding something. Please guys help me out I'm going nuts. Thank you for reading this.