marriage issues or lack of

Well they have just had their second child and she really wants to marry him she heavily believes in marriage and so does the family but he has just come out with "I'll never marry you" she's in pieces he says he will never marry her because she's been married before and she's upset because they just had two kids and he should've said this before the kids because it's causing major issues

Do you think he is in the wrong or is it justified?