What does it mean when a man says, "I am not husband material"?

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I was on a date with a man who I've been writing to over a year on a language website. So when I met him (for the 3rd time) he asked me about my husband. I think this had been on his mind for a long time. When I explained I was no longer married, I asked him about himself. He looked it up on his cell translator and that's what it said. So I didn't think much of it, but I guess it means he does not see himself as a candidate for marriage, or that he is good for it.
What does it mean when a man says, "I am not husband material"?
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