@Emmy512 ,
Hi Emmy,
I have faced the same situations before.My advices are that you should keep calm first and find something you interested it.Your insecure will kill you sooner or later,believe me.
You should have your own life,you know?
Not sharing the passwords is normal,do not check your husband's iphone,ipad or any others from now on...Just believe him in your heart.
Maybe you take some more time on cooking and send some pictures to let him come back to have a dinner.Just talk some memories you both have is a good idea.
I know it is so hard for you,but you should do it if you don't want to loose him.
Hope you will be OK!!!