You don’t have to be okay with it. Unfortunately, addicts do tend to lie. Mine has done… he thinks I don’t know about some of the lies because I never confronted him about them as I just couldn’t see the point.
When you are in a relationship like this, you have to decide what you will or won’t tolerate. You don’t have to stay in a relationship with someone who lies about drugs and pub visits and who can’t give you assurances.