Before you start saying I'm super paranoid I just want to give some background. First she hates WhatsApp and social media in general and hardly ever uses it. In fact the time she does it is to chat to me. Secondly she has recently started a new job and finishes at 12am. We always wish each other good night just before we sleep. Over the past few weeks she's been wishing me good night after work when she has got home like at 12:30 but I've noticed she's still last seen on there at 3am for a couple of days now. Before this new job she would always last be seen when we both said night to eachother and we would sleep.
Not only that but today she did the same thing but also she changed her profile PIC in middle of night. Her old profile PIC was a cute holiday snap which she had for last 2 years but this new one is more like a erotic selfie duck face which is very out of character for her. Feels like she's changed it to impress someone.
Combining all these together and I think she might be potentially cheating (emotionally or physically). Maybe with somebody from work who she has given her number too?
What do you think? How should I deal with it? I want to talk to her about it but fear driving her away with my insecurity if I'm wrong.