Why are you keeping your phone away from your partner ?

Why are you keeping your phone away from your partner ? Why can't you give your partner your phone ? In relationship a lot of things comes with and the most important there is trust faithfulness which is very today to see I have always wondered, why the relationship when you can't trust each others ? Why complain of heart break when at the beginning there's no sincerity ? On several occasion people as raise issues on partners having issues with each others phone and the argument don't usually ends well All we support is - don't allow your partner check your phone or even knowing the password I wonder why ? Although some keep there phone off when with partners just for fun Why don't you want your partner to check your phone ?