Whenweawake,
I think you are a bit insecure, and you are reading too much into this at this point. Accept the fact that he has had girlfriends before you. The fact that he had old texts and pics of his ex is an irrelevant detail. You have had boyfriends in the past, and he is ok with that. Why can't you be?
I have a long time interest in psychology, specializing in relationship dynamics for 30 years.
(Please note, we give the best advice we can based on the information given in a post. For better advice, please include the age of all romantic partners.)