So idk what to do!

This is in my husbands inbox. I have been answering this guy because I had a feeling he was messaging for drugs because my husband isnt friends with this guy. I have been deleting my reponses. Yes my husband knoes I have his password. We have been struggling with this so I check his stuff. I know it isnt healthy. My husband isnt on nerve pills or pain pills. He isnt a dealer. He is friends with a guy that is.. we had this huge blow out over this monday and this guy messaged today. Does that mean my husband is still doing this? He also use to do drugs. Im so angry. I just dont know how to handle this anymore.