Why am I suddenly getting texts meant for my husbands phone

Just because this behavior has worked before is certainly no guarantee it will continue to work. It was incorrect before and it is incorrect now.

RockyRufusFrankSyd wrote:

We share one so that we can share pictures and music.

This is correctly done using Family Sharing.

Family Sharing - Apple Support

The person acquiring a new Apple ID needs to thoroughly cleanse her/his device(s) as follows:

What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch - Apple Support

How to create a new Apple ID - Apple Support

Are you sharing an Apple ID? Stop doing that immediately.