I found out my SO has a snapchat I've asked him if he has one he's say no he don't need one but today I seen he had the app on his phone so I clicked on it he was not logged in but his user name was there to sign in. Why would he lie ? I don't hide anything from him , i don't care if he has friends that are girls but lately he's been trying to talk to girls he used to flirt with or sometimes is talking to his ex And he's been very mean and snappy lately and he's usually always mellow so that's why I'm getting a little worried.