Smart move . Sorry you are having to go through this . I had similar situation happen to me so I’m always wondering if he has any secret accounts . I discovered his because he let me use his you tube red account and after I signed in I noticed I was also linked to his email account and couldn’t resist looking one night . I only had found that he attempted to reactivate his old Instagram but it failed to happen because he waited too long . ( we both agreed not to use fb , IG , and most other sites because it was causing us issues ) He began to get suspicious because he was getting notifications to a different email alerting him of a sign in from a unknown device . So he changed the password and won’t let me have access to his YouTube red anymore . But I know there has to be another way to find out if he’s privately on any social media sites . Just haven’t figured it out yet .