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Thank you, will try soon. xo
In my opinion, I really do think it's best that you are completely honest with him about how this makes you feel. In order for him to fully understand where you are coming from, you should inform him about what you found on the online history, and about how it affected you. If you were to saying nothing, this would probably continue and most likely make you resentful.
It's not ever ridiculous to voice your feelings or opinions to someone who you share your life with. It's possible that he has no idea that he offended you by saving the videos. Maybe he was hoping to get your attention, or spark your interest, by saving the videos to favorites? Whatever the case is, don't ignore this issue, it's vital to your relationship to talk about your concerns openly.
Good Luck