should i ask him about it?

okay so me and my boyfriend have known each other since 8th grade, we’ve always been on and off but now (our junior year) we’re finally dating after we’ve brother had tried it w 2 other people. anyways, i have his instagram account on my phone (he knows), i went snooping and looked at his likes and saw that he follows this girl from Sweden and i noticed he had liked 7 of her pictures from august in december... we’ve been dating since october. he also follows her private account and she posts lowkey nude pics and he’s liked those and there’s some from 2 days ago and stuff like that. it’s really bothering me and i have no clue what to do. it’s not like him bc he’s like super crazy about me and pays no attention to other girls like ever but seems to like this girl a lot. what do i do, do i tell him? ugh