Talk to your best friend, talk to your parents, talk to a therapist, don't talk to your wife.
Your wife loves you so if you say you are depressed, she will be understanding and let you lay in bed all day if you want. She will make meals for you, she will do the chores around the house because she wants to help you and you feel too tired to do those things.
But depression will only get worse if you do this.
Maintaining appearances is important. You need someone to make an effort for. You might feel like shit right now, but you will feel a lot worse when you can't even get up in the morning because you let your standards slip. Don't do it.