Cheater caught, please advice

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I was with my boyfriend at his house. He has a projector in his room that your phone can connect to and it’ll project your phone screen. He slid to different page on his phone and there I saw it- Tinder. He saw the app as soon as he scrolled, turned off his phone connection and turned it back on two seconds later. I don’t know what to do because my moms house is locked and it’s 1am. I didn’t confront him but it was clear he was guilty because he kept telling me how much he loved me. I’m terrible at confrontation. Someone please give me advice I’ve never dealt with this before