What are the unnoticeable signs if a narcissist is cheating? Cell phones are the biggest teller someone is cheating in this day and age. If you're worried your significant other is unfaithful watch for these signs in conjunction (Cheating is cheating. These signs are all applicable to neurotypicals too 1.) They are always on their phone and you can't figure out who they might be talking to. Sure, the Narcissist can name any friend in the book but something will still feel off about it. They never seemed as chatty with their friends in the past, why start no 2.) Their phone is always on silent. Cheaters can recieve unexpected texts all day, if you don't hear notifications go off they're easier to cover u 3.) They're running off to the bathroom with their phone more often. If you notice your partner suddenly having bladder problems it might just be a ploy to get some privacy fas 4.) They always position themselves so you cannot see their phone screen as they tex 5.) ...