AITA for going to my boyfriend‘s phone?

Let me start saying hi throwaway account my boyfriend is 22 male I’m 22 female and I went through my boyfriend‘s phone and let me tell you what I have found so I found text messaging from one of my friends will call her grace and back in 2021 text messages from them because they went to the same high school that they talked for a little bit and when I first got with my boyfriend, my friend Grace told me that in high school he asked her out and she rejected him not with the text messages say basically them flirting back-and-forth, and they hung out outside of school and then I go to my friend let’s call her Penelope text messages scroll all the way up like I did with Grace and guess what they also talked in high school same shit flirty and that they were hanging out which Penelope told me that she knew him from high school, but didn’t tell me that
Now I just feel stupid like I didn’t know, Grace and Penelope for that long I wanna stay year so far but why wouldn’t they tell me that? Why wouldn’t my boyfriend tell me that like I just feel stupid because they didn’t tell me I feel stupid because my boyfriend didn’t tell me I feel stupid for being friends with them when my boyfriend is just sitting there like ha ha and I knew my boyfriend had a crush on Grace but I thought it was long gone. By now we also went to Grace’s college graduation recently and I generally got upset because he kept on asking where Grace was at the time I was there for Grace and one of my other friends that graduated at the same college my boyfriend also does not know that I know that he had a crush on her in high school I know I don’t know if I should talk to my boyfriend about it or just pretend like I don’t know anything I’m definitely avoiding Grace and Penelope now because if no one’s gonna tell me the truth, why am I friends with you? was my fault that I feel this way because I went to his phone. Was I asking for something to go wrong? Am I the asshole for going through my boyfriend‘s phone? And any advice would help.