I want to be there to help him beat this addiction.
Being there is not going to make a bit of difference when it comes to
him beating
his addiction. That's something that has to come from within him. Recovery doesn't come from an external force. It's not something you can help with.
Think about your daughter first and foremost. If you put her long term emotional well-being first and foremost - before your husbands or your own, you won't regret your decision, whatever that is.
Have you talked to your family or friends about a safe place to stay temporarily? It's so helpful when you have a strong support network around you.