Upset over porn.

I am not the type to look through my mans phone. Ive probably done it 3x in our entire 6 years. Well, the night before last he literally left his phone unlocked ( idk his password). Well our sex life has been struggling so I thought I would look. Found out he watches porn just about everyday. Specifically *milf* porn. Saw he had searched a particular womans profile name on Instagram too, by name, which was some IG model he has no chance with. I see this and was upset. Now, im 30. I look good. 34 DDs, long hair , nice butt. I take care of myself. But last night initiated sex, and he was very interested . He stayed hard the entire time but wouldnt finish. We eventually just gave up. I feel like he has conditioned himself to finish by jacking off to these porn videos. Do you ladies deal with this ? Also, I feel like I invaded his.privacy by looking. I could never straightup look him in the face and say why are you watching milf porn everyday . That would be so embarassing to him and I could never hurt him like that. Who wants to admit that? Other ways of bringing it up without letting him know I seen it?