In my opinion your reaction is perfectly normal. I would have acted the same way as you if I had been in your shoes. There is a difference between noticing attractive people on the street and taking photos of them, objectifying them sexually, when you are in a relationship. I understand fully how you feel about a lack of trust in your boyfriend now. You have reason to be concerned about moving in with him in August. What he has done is unacceptable for someone in a relationship, like you two are. I am glad to hear that he has apologized many times and realized he had done something wrong. It is up to him now to make it up to you through time so that you may regain trust in him again. Is this the first time something like this has happened or has he given you cause for concern in the past? If that's the case and this is a repeated action this is a warning flag for your relationship - maybe he is not the right guy for you.