Are you typing this post or is it your depression?

Your wife is free to leave, if that is what SHE wants.

You are free to leave, if that is what YOU want.

You cannot leave her while claiming that it is in her best interests to be free of you.

That is dysfunctional. Only she can determine what is in her best interests.

If you don't want to have kids then you must be honest about that. If she wants to have kids then that is something you will have to face as a couple.

Using the "i'm leaving you because i don't deserve you" excuse is beneath you and, quite frankly , an insult to her and her love for you.