I had to learn the hard way. I would confront my husband and as always just be lied to (gaslighting). It caused me to have self doubt, anxiety, anger, etc. I made myself crazy trying to prove something I already knew but refused to believe.
If you have any doubts, then let it unfold. I watched and learned from his behavior. The lessons I learned helped me to trust my own instincts again. Today, I can just hear his voice and know.
I had to learn and remember.....my husband wanted his addiction and his family. Having his family allowed him to perpetuate the lies addicts tell themselves. "I have under control, I am not that bad" etc, etc.
IMHO, every time I asked my husband to lie to me, I was simply feeding and empowering his addiction.