My girlfriend doesn't know I know she's cheating on me. What should I do?

Anonymous
OK so my girlfriend had a serious relationship before me and since then we have been together for over a year and a half. Recently out of sheer luck I found her exes cell phone at a local taco bell. And I saw naked pictures of my girlfriend in his pictures. And he had some From just a week before sent to him right after she died her hair blond. I started texting her acting as him and found she loves him too and as much as me. So I have no idea how to confront her or if I even should. Help please
My girlfriend doesn't know I know she's cheating on me. What should I do?
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