It is your money OP. Threads on here about spending 10K on a handbag get met with your money, your choice.
22k on a wedding pre-kids, I don't think it's unusual.
But it sounds like he had 7k already, and then a further 8k added was the honeymoon, other wedding costs and things you have maybe shared together married?
If that's the case, then I'd be wanting to help out with half the debt, but I would still be saving. Savings are so important. It's a nightmare not having any, and so many people aren't in positions to save, as there is no disposable income.
If you go on maternity leave, because you have decided to have children together, your husbands wage is joint money (as it is now). This is a different situation entirely.
This is debt, half ran up before getting together - the other ran up through lying and saying he had savings.
Maybe the OP wouldn't have spent 22k on a wedding, if she knew marriage was already starting off in debt 7K?
Plus, the OP didn't get into debt to afford the wedding, she had savings.
This is coming from someone who doesn't understand wedding expenses as me and DH had a quiet registry office affair that cost hardly anything at all 
If it were me OP, I would be upset about the lying. I'd help him make a plan to clear the debt. Then I would continue to save, and then forget about the debt. Just pay it off each month, and forget about it.
My worry is, if you bail him out, by clearing it quickly, he's already had deposit help with getting a house...I'd be worried if he does this again, and you are on maternity leave with a baby, and you have decided not to save a penny and clear the debts...what then?
Spending beyond means is not good for starting a family.
Help out with some just because you love him (I'm guessing!) but keep saving (the savings, BTW, are family savings for both of you).
Hope you're able to work things out. Just keep talking.