Need advice

tia

My fiancé is in the navy and is gone for 6+ months and he only left 2 weeks ago. I hate when he leaves because I’m woman with needs and he is a man with them. We always have the talk before he leaves but while he is gone I sit here lonely sad and like a dog in heat but I’m nervous because idk if he is being faithful or not. I hope he is and if he isn’t it’s ok but I just want him to be honest. How do I ask him about it when he has time to talk to me without putting him on the defense?