Feeling betrayed and stupid

I have been with my partner for 2 years. We live together and hes been a great step dad to my two children. He is divorced. About 8 months ago when we were both looking at pictures on his ipad I noticed pictures of his ex wife that were recently downloaded. He said that he does that sometimes because he likes to look at her picture when hes angry as he hates her. I dont get the feeling he hates her. Then today when I was on our iPad I noticed he has done the same again after I told him I wasnt comfortable with it. I have no problems with old pictures. But I dont see why he is downloading new pictures of her and storing them all the time. It makes me feel like crap. and I feel like he isnt over her. Maybe I'm over reacting. But I feel so betrayed that he would do it a second time knowing that I was not ok with it. I also found pictures of a naked women who Is a friend of his, sent to him within out relationship. Again he had an excuse he said that shes been sending him nudes for years and he just doesnt look at them. I don't know what to think anymore. I just feel so horrible like I'm wasting my time. This man tells me he loves me everyday and now I'm starting to feel like it's all a lie