urgent boyfriend advice!!!

the other day my bf left me alone in his room and well he left his phone… so i guess we can see where this is going. i didn’t want to look through it but i was just so curious so i just did a light look through and i stumbled upon his My eyes only on snapchat (basically a photo folder on snapchat that has a password) so i tried his phone password and it ended up working. i sat there scrolling for 1 min seeing a lot of pictures of different nude girls. i obv couldn’t say anything but the next day when i was laying in bed with him i went through my snapchat and to set him up i went through my eyes only infront of him which has nothing bad on it. i then proceeded to say “let’s see your eyes only” and be snapped i have nothing in there. so now i don’t know what to do because i can’t tell him that i snooped but it sickens me to know he still has them on his phone. help