Checking spouse mobile phone

Is alright to check to get a sense of security but be upfront about it. That it is an issue with yourself. The worst is to masquerade as you suspect he is having an affair hence you need to check his facebook, any normal person will feel offended and resist. If you say darling, I'm feeling insecure and I am not suspicious of you, can you comfort me by allowing me to check your facebook account and hp? That a guy might melt and even wear a chastity belt. (just kidding)