I would hope for the best, but definitely prepare for the worst. He's been gone a week or more, with hardly any contact. A marriage is supposed to be 2 people consistently living together, not worlds apart and barely speaking. That's NOT a marriage. That's not even a relationship. God will only change Steven if Steven WANTS to be changed. If he doesn't, then God won't force him to come back to his marriage.
I'll leave you with this verse: Luke 1:37.
"For nothing shall be impossible with God".