Do you confront your partner over Snapchat and her photos?

Do you confront your partner over Snapchat and her photos?

“I unlocked my girlfriend’s phone out of boredom while she was in the shower. I knew her passcode from seeing her unlock it before.
I opened her snapchat and noticed she had streaks going with people I’ve never heard of. In her photos, she had a bunch of lingerie pics that she’s never sent me.
Is this something I should be worried about, or could it be innocent?”