i accidentally saw my friend naked when i didn’t mean to

I was staying over at my friend’s house’s a couple days ago for mid autumn festival. I was going to ask to use the shower, but my friend went in before I did. While i was waiting to use the shower (the room i was looking out of faces the hallway straight on, the bathroom door opens to the right), I saw my friend quick get out to get her clothes, which were sitting in the hallway. I don’t really get why she left them there, it was probably a mistake. Although it was very brief, i saw my friend naked. I didn’t mean to look, and she didn’t notice me, but i feel really bad about it. I wasn’t supposed to see her naked, and i have romantic feelings for her, which makes it even worse. Plus, i didn’t look away when i should have. I couldn’t pull my eyes away. I don’t know if i should tell her or not. I feel really bad about it. I saw a part of my friend i never should have had access to.