Trust Issues that are breaking my heart 😔

I know this isn’t TTC but I just need advice. Me and my boyfriend have been trying to have a baby for about 2 months. And we’ve been together for 4 years. We’re as happy as can be and what any couple would hope to be. (At least that’s how I feel) today was the second time I found porn pages on his Instagram search history. NOT SUGGESTED! His SEARCH HISTORY. The last time I brought it up to him he completely denied it and said he didn’t do it. “Maybe it was a glitch” this time I brought it up and he smiled and said “all I look up is art and band pages” how do you explain how they just randomly appear on his search history. What do y’all think? Is he looking at porn or could it be a glitch?