I found out My bf has Tinder apps on his phone... What should I do?

Anonymous
I just found out his phone has tinder apps. His niece was playing with his phone and she accidentally hit his Tinder and I saw his phone screen was showing girls pictures.
I don't know anything about Tinder but does that mean he is actively using?

Should I ask him to show me the apps? He used to be active in the other dating site and I asked him to stop using and he deleted the account. Back then he said he is trying to make friends on there but he understood me and deleted the account immediately. We have been dating for only 3 months so he might have had Tinder on his phone before I met him and he may have not used it since then,... Is there any way to find out? I didn't want him to think I don't trust him but I can't help thinking about it...
I found out My bf has Tinder apps on his phone... What should I do?
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