I found something on my partner’s phone… and I wish I hadn’t

I wasn’t even snooping. Their phone was right there, and I just opened it without thinking. And I saw messages that I wasn’t supposed to see. Nothing extreme. No clear cheating. But enough to make me question everything. The tone, the way they were talking… it wasn’t how they talk to me anymore. That’s what hurt the most. I closed it immediately, but I can’t unsee it now. And the weird part is, they’ve been completely normal with me. So now I’m stuck acting normal too… while my mind keeps going back to that moment. I don’t know if I should bring it up or just pretend I never saw it. But clearly, it’s already changed how I feel.