My boyfriend has Tinder app on his phone?

IJustHave1Question
Yesterday, my boyfriend was having trouble with his Pokemon Go app and asked me to fix it. When I closed it and went to reopen it, I noticed that he had Tinder on his phone. When I asked about it, he said that a friend downloaded it to show him some girl he was talking to. I believe him but it is disheartening when my friends keep saying that he must be using the app. I believe him because he leaves his phone with me all of the time (both of us don't have locks on them), he explained why it was on there so seamlessly that it didn't feel like he was lying at all, and we are moving in together (wouldn't a guy who wants to cheat postpone that as much as possible?) anyway, what do you guys think? Am I being naive or is he being really truthful?
My boyfriend has Tinder app on his phone?
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