On one hand, I hate to say it, but it is, in a sense, being insecure. You've allowed someone else to undermine your confidence and self esteem. You've got to examine this relationship and ask yourself, what are the good things you get out of this relationship. I'm concerned that he showed no interest in your disk, that he left it where anyone could have found it and showed no real interest or thankfulness for such a personal gift. In the future, think twice about doing such a thing for anyone, as these pictures could have been picked up by anyone, and no matter how in love you are with someone, these pictures could have at some point been used against you. Once these types of pictures are on the web, it is absolutely impossible to get them off the web, they are there for life.
The fact that he's not willing to take into consideration about how you feel about his collecting and staring, and in fact is getting angry at you for feeling the way you do is telling me that you are far more invested in this relationship than he is.
You are beautiful and perfect the way you are. Somehow, you have allowed someone to take that away from you. You can look at it one way, he may look at the big breast, but he's with you. Some men like watching boxing, but would never get in the ring, so as long as he's not cheating on you, then it may just be a fetish that he has that may never manifest into anything else. On the other hand, his staring at women's breasts in front of you is disrespectful, and his anger toward your emotions is unwarranted.
Only you can take back your confidence and self esteem. If he wants to continue to act this way, you may want to consider ending the relationship. Think about it, is it more important to love him or love yourself?
I welcome your thoughts, let me know if you want to talk more