This might be weird

So I'm against porn and I think my fiancé is addicted, we have been together two years and have had 2 talks about how I dislike it and if he watches it again I'm leaving (I didn't want to say that he nothing else worked) I kept finding things on his phone he's been good, but he was watching "vaginal ultrasound" videos and looking at pictures of the vaginas with the things in them and I'm not pregnant, I confronted him about it he got all mad and turned it into my fault.. why would he watch that? Sorry if that was weird but he's been looking at weird things