Female workout partners

My boo just got Herbalife.

He and the woman that he bought Herbalife from has been in frequent communication (about once a week). He calls her his accountability partner.

He sent her a picture of him in the gym. And was like “1 mile down”. I caught him messaging her today, and got annoyed. I just don’t understand the point.

Didn’t notice any flirting. She’s attractive— I just don’t see what they need to talk about. I work with him quite a bit (I’m a former division I athlete).

Do you feel like that’s fishy?