My fiancé is acting strange ...

He's currently deployed and the only way we talk is through text or FaceTime. He usually calls me after work when he gets home, but this past week, he'll only stay on the phone for 5 minutes max.. And he calls from outside his apartment. He refuses to go inside but today he called from his living room and kept looking to his left while talking to me. And then the last time he looked, he quickly ended the call without even saying bye and turned his phone off so I could no longer call or text him. He's also been keeping his phone off a lot more often and claims that he's "not near it" if he misses my calls when I know he has his phone on him and is checking it 24/7. Idk what's going on but he has cheated on me before and I feel like it's happening again. :/ What does it sound like to you guys?