My Long distance boyfriend has tinder

This is our 2nd trip together. He was showing me a song on his phone and while he was doing so I saw the tinder logo on the phone. I was shocked but didn't react. We are on a trip abroad so even if we fight and leave. I really wouldn't know where to go. Do I wait till our last trip's day to face him? Do I do it now? I don't know what to do in the first place

Also it wasn't like a notification or something but the logo among many other logos. So he probably don't know that I know

Help!!