I think I'm going to forget my wife's card
Why are you going to do that?
She is always being so controlling so I'm going to forget the card she kept demanding I remember.
You should never deliberately forget an important item that belongs to your wife.  This could cause real problems for her, and it could just encourage her to be even more controlling if she thinks that you are unreliable.
Who's to say that I won't just leave her soon so who cares if I forget?
If you are unhappy with your relationship, how about trying out marriage counseling first? There's not need to complicate the relationship further by forgetting her important things. Don't you want to save your relationship?