Boyfriend has a secret crush on another girl and doesn't know that I know. What should I do?

Been together 6 years. Both in our 20s. Recently noticed him liking literally every single post of this specific random girl he follows on IG. And a couple times when I went on his search bar history, her profile is there waiting to be clicked... I feel so hurt b/c it's obvious that he fancies this girl a lot to go out of his way to search up her profile and look at her pics. What makes me feel worse is that he gives no hesitation to like her pics but when ever I post selfies he hardly likes any of them. I always thought your boyfriend was supposed to be your #1 fan but it looks like he's too busy being hers. This girl doesn't even post anything provocative, she's just really pretty and shows similar interests as my boyfriend. Besides this he treats me well, gives me compliments regularly, shows love and spoils me but I just can't help feeling betrayed and like a settlement still compared to this girl. Its to the point where I just want to go in his phone and secretly unfollow her myself from his account and have her unfollow him but really I'd rather bring it to his attention and ask him why he's stalking her, see what he says? I don't know I just want to know for sure do you think my reason of hurt is valid?

Boyfriend has a secret crush on another girl and doesn't know that I know. What should I do?
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