reading into this to much ?

So last night I decided to take some sexy nude pictures for my SO. And while in his phone I took maybe 10 pictures because I couldn't decide which one I wanted him to see. When I went to his photo album I saw a screenshot of a text message between him and an old female cop coworker. They don't work in the same precinct anymore. But reading the text made me feel uncomfortable. He claimed it was nothing and they are good friends. His phone is messed up and screenshot things randomly. How would you feel if you saw a text like this in his phone? He's in the orange and her reply is in the white. I couldn't see the rest of the message because he deleted the conversation out of his messages