What does it mean when a man says future love is “God’s business”?

What is a man thinking when he answers 'It's God's business, it's unknown, I don't know' to the question 'If we happen to break up one day, would you love someone else again?' Is he being honest, or is he someone to stay away from?
​If he said, 'If we break up, it must be for a major reason. We wouldn't break up over small things,' and then added, 'If something like that happens and we break up, I don't know, it's God's business'?
What does it mean when a man says future love is “God’s business”?
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