You know... we dont have to tell you.
You have a gut... whats it say? We dont even know your husband but what we do understand is he is using his 'sponsor' role as a ticket to ride.
Next time, call him out... tell him you will stay quietly in the car. If he resists or hesitates, there ya have it. If he becomes defensive, file for divorce lol. Defensive = double dippin' in da honey pot.