New to this

I need some outside opinions because I’m clueless when it comes to dating apps but not stupid.
I’ve been seeing a guy for about four months. We had the we are exclusive we are not on the apps, not dating or talking to anyone else conversation. So after what happened ended things.
My cousin recently saw him on Tinder and Hinge. She matched with him on purpose because she wanted to confirm it was actually him and he was using the app before telling me. She was actively on the app within the last few weeks so she says there’s no way this was an old profile from months ago.
There was also a heart by his name on Hinge. That would mean he has recently been active on hinge right? So She swiped on him on tinder then wasn’t on the app much for around a week. When she got back on she got the info they matched. After she messaged him, he blocked her. I saw the screenshot of them matching.
When I confronted him, he said he deleted all the apps months ago and wasn’t on the dating apps. He said the apps aren’t on his phone he deleted them off so maybe he didn’t deleted the accounts he doesnt know how it works but he doesn’t have the apps.
My cousin said it was recent because she literally saw and matched with him while using the app last week. I definitely believe her and like I said I broke things off with him. I guess I just want outside perspective.
Would you believe his explanation? Is there any legitimate way this could happen if he really deleted the apps months ago? And what do you make of him blocking my cousin after she messaged him? I have broken up with him. But he wants to talk about everything. I don’t know how dating apps work.