Question that needs answers ..

My bf isn’t very talkative, but he gives good advice sometimes .. just depends on the topic. Well, he talks to his best friend about every thing & I saw something in his phone that puzzled me. No girls seem to text his phone, call him, or anything .. but he sent a nude picture of a girl he used to be involved w/to his best friend & if the girl sent it to him he hadn’t mentioned it at all. So should I think that there is still something going on?