What happens next?

How to hire a nanny who won't hit on your spouse
Reach out to friends and family members.
This is a good start if you're looking for a quality nanny. If you have friends and family members with children, you can ask them for recommendations.
A close friend or family member is unlikely to suggest a nanny who's had issues with professionalism. They may be able to steer you in the direction of a nanny who's unlikely to hit on your husband.