I think my boyfriend may still be using tinder, how can I confirm?

so I know the obvious answer is to ask him but there's no guarantee he'd be honest. I trust him a lot but unfortunately have been given some reason to think that he may still be using tinder. We've officially been together for two months and he had told me way back then that he had deleted the app, so I went ahead and deleted my whole account (it's no longer retrievable). do you ladies know of any way to check if he's on tinder? There are two specific girls I think he may be talking to but I don't want to reach out to either one of them.