Do not equate impatience and longing with a lack of faith. Faith is between you and God, and the rest you rely on him for. Have you prayed for your wife? I really mean that.
Not just pray that she will come back, but pray for her clarity of thought, her happiness, her safety? Do you pray for her to be the best mother she can be? Do you pray for the Lord to bring her all the wonderful blessings she deserves.
And yes, no matter what has happened, you should.
And what does she see in those moments? Do you ask how she is? Do you ask about her with true interest? Do you ask if there is anything you can do for her? Are you not only acting as if, but truly shining? Is your house spotless, children dressed and prepared, you looking good, confident, happy to see her, even it is for just moments?
I believe you are strong enough. I believe you can be the man she needs in her life. It is up to you to pull through and not tell, but show her that you are all she will ever need.