Found my boyfriend [25M] has texted a girl . I am [25F]

I opened his profile and saw that he has texted a girl who he followed today . He has texted “what’s up? Everything all good “

This seems a reply but there are no earlier texts . And he followed this profile today only

That girl havent yet followed him back and nor seen his text .

He dont know I have his id . And I want to play smart . But dont know how as my hands are shaking

We have decided to meet tomorrow. I called him today and he did pick up my call , it been an hour .