It's bad to read someone's private conversation without them knowing.
Tina notices her boyfriend has been messaging a female friend of his all day.
Tina wants to know what they are talking about.
Tina casually asks her boyfriend directly what they are talking about.
Tina waits for her boyfriend to go to the bathroom and checks his phone.
Tina's boyfriend is happy to share what they've been discussing.
Tina gets caught looking through his phone and her partner feels it's a violation of privacy.