I am really p*ssed off and about ready to leave my fiance because he took pics of women. Why does he do this?

He took several pictures of women in their bikinis and butt shots without them knowing on our vacation together. I am so p*ssed right now. I found them after we got back and loaded them onto our computers. Is this voyeurism? He is starting to look like a pervert to me and it is making me sick to my stomach. I can't believe the gall he had to do this while we vacationed together. What is "wrong" with him?? It is of girls frolicking on the beach in their bikinis. A shot of one woman from the back standing on the beach reading a book and then a butt shot of her. Another of a women in a bikini standing on sailboat up front. We were sitting down behind and beside her. He takes full pictures of her from where he was sitting of what she looks like from behind. It's maddening and sickening. It is so disrespectful. I really needed to vent.